SELECT 
  SQL_CALC_FOUND_ROWS (
    CASE WHEN products.parent_product_id <> 0 THEN products.parent_product_id ELSE products.product_id END
  ) AS product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  MIN(
    IF(
      prices.percentage_discount = 0, 
      prices.price, 
      prices.price - (
        prices.price * prices.percentage_discount
      )/ 100
    )
  ) as price, 
  GROUP_CONCAT(
    products.product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_ids, 
  GROUP_CONCAT(
    products.product_type 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS product_types, 
  GROUP_CONCAT(
    products.parent_product_id 
    ORDER BY 
      products.parent_product_id ASC, 
      products.product_id ASC
  ) AS parent_product_ids, 
  products.product_type, 
  products.parent_product_id, 
  descr1.full_description as full_description 
FROM 
  cscart_products as products 
  LEFT JOIN cscart_product_descriptions as descr1 ON descr1.product_id = products.product_id 
  AND descr1.lang_code = 'en' 
  LEFT JOIN cscart_product_prices as prices ON prices.product_id = products.product_id 
  AND prices.lower_limit = 1 
  LEFT JOIN cscart_product_prices as prices_2 ON prices.product_id = prices_2.product_id 
  AND prices_2.lower_limit = 1 
  AND prices_2.price < prices.price 
  AND prices_2.usergroup_id IN (0, 0, 1) 
  LEFT JOIN cscart_companies AS companies ON companies.company_id = products.company_id 
  INNER JOIN cscart_products_categories as products_categories ON products_categories.product_id = products.product_id 
  INNER JOIN cscart_categories ON cscart_categories.category_id = products_categories.category_id 
  AND (
    cscart_categories.usergroup_ids = '' 
    OR FIND_IN_SET(
      0, cscart_categories.usergroup_ids
    ) 
    OR FIND_IN_SET(
      1, cscart_categories.usergroup_ids
    )
  ) 
  AND cscart_categories.status IN ('A', 'H') 
  AND cscart_categories.storefront_id IN (0, 1) 
  LEFT JOIN cscart_ec_extra_product_data AS epd ON epd.product_id = products.product_id 
WHERE 
  1 
  AND products.product_id NOT IN (136) 
  AND companies.status IN ('A') 
  AND prices.price >= 0.00 
  AND prices.price <= 0.00 
  AND (
    products.usergroup_ids = '' 
    OR FIND_IN_SET(0, products.usergroup_ids) 
    OR FIND_IN_SET(1, products.usergroup_ids)
  ) 
  AND products.status IN ('A') 
  AND prices.usergroup_id IN (0, 0, 1) 
  AND prices_2.price IS NULL 
  AND epd.product_id IS NULL 
  AND products.product_type != 'D' 
GROUP BY 
  product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  0, 3

Query time 0.00390

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "40.34"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": true,
        "buffer_result": {
          "using_temporary_table": true,
          "nested_loop": [
            {
              "table": {
                "table_name": "companies",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 1,
                "filtered": "50.00",
                "cost_info": {
                  "read_cost": "2.29",
                  "eval_cost": "0.20",
                  "prefix_cost": "2.49",
                  "data_read_per_join": "8K"
                },
                "used_columns": [
                  "company_id",
                  "status",
                  "company"
                ],
                "attached_condition": "(`pankajecarter_systemsix`.`companies`.`status` = 'A')"
              }
            },
            {
              "table": {
                "table_name": "cscart_categories",
                "access_type": "ALL",
                "possible_keys": [
                  "PRIMARY",
                  "c_status",
                  "p_category_id"
                ],
                "rows_examined_per_scan": 85,
                "rows_produced_per_join": 3,
                "filtered": "4.00",
                "using_join_buffer": "Block Nested Loop",
                "cost_info": {
                  "read_cost": "19.80",
                  "eval_cost": "0.68",
                  "prefix_cost": "22.97",
                  "data_read_per_join": "11K"
                },
                "used_columns": [
                  "category_id",
                  "storefront_id",
                  "usergroup_ids",
                  "status"
                ],
                "attached_condition": "(((`pankajecarter_systemsix`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`pankajecarter_systemsix`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`pankajecarter_systemsix`.`cscart_categories`.`usergroup_ids`)) and (`pankajecarter_systemsix`.`cscart_categories`.`status` in ('A','H')) and (`pankajecarter_systemsix`.`cscart_categories`.`storefront_id` in (0,1)))"
              }
            },
            {
              "table": {
                "table_name": "products_categories",
                "access_type": "ref",
                "possible_keys": [
                  "PRIMARY",
                  "pt"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "category_id"
                ],
                "key_length": "3",
                "ref": [
                  "pankajecarter_systemsix.cscart_categories.category_id"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 6,
                "filtered": "100.00",
                "using_index": true,
                "cost_info": {
                  "read_cost": "3.54",
                  "eval_cost": "1.36",
                  "prefix_cost": "27.87",
                  "data_read_per_join": "108"
                },
                "used_columns": [
                  "product_id",
                  "category_id"
                ],
                "attached_condition": "(`pankajecarter_systemsix`.`products_categories`.`product_id` <> 136)"
              }
            },
            {
              "table": {
                "table_name": "products",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "status"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "pankajecarter_systemsix.products_categories.product_id"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 0,
                "filtered": "8.82",
                "cost_info": {
                  "read_cost": "6.80",
                  "eval_cost": "0.12",
                  "prefix_cost": "36.03",
                  "data_read_per_join": "3K"
                },
                "used_columns": [
                  "product_id",
                  "product_type",
                  "status",
                  "company_id",
                  "usergroup_ids",
                  "parent_product_id"
                ],
                "attached_condition": "((`pankajecarter_systemsix`.`products`.`company_id` = `pankajecarter_systemsix`.`companies`.`company_id`) and ((`pankajecarter_systemsix`.`products`.`usergroup_ids` = '') or find_in_set(0,`pankajecarter_systemsix`.`products`.`usergroup_ids`) or find_in_set(1,`pankajecarter_systemsix`.`products`.`usergroup_ids`)) and (`pankajecarter_systemsix`.`products`.`status` = 'A') and (`pankajecarter_systemsix`.`products`.`product_type` <> 'D'))"
              }
            },
            {
              "table": {
                "table_name": "prices",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "usergroup",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "pankajecarter_systemsix.products_categories.product_id"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 0,
                "filtered": "3.08",
                "index_condition": "((`pankajecarter_systemsix`.`prices`.`lower_limit` = 1) and (`pankajecarter_systemsix`.`prices`.`usergroup_id` in (0,0,1)))",
                "cost_info": {
                  "read_cost": "1.52",
                  "eval_cost": "0.01",
                  "prefix_cost": "37.79",
                  "data_read_per_join": "0"
                },
                "used_columns": [
                  "product_id",
                  "price",
                  "percentage_discount",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "((`pankajecarter_systemsix`.`prices`.`price` >= 0.00) and (`pankajecarter_systemsix`.`prices`.`price` <= 0.00))"
              }
            },
            {
              "table": {
                "table_name": "prices_2",
                "access_type": "ref",
                "possible_keys": [
                  "usergroup",
                  "product_id",
                  "lower_limit",
                  "usergroup_id"
                ],
                "key": "usergroup",
                "used_key_parts": [
                  "product_id"
                ],
                "key_length": "3",
                "ref": [
                  "pankajecarter_systemsix.products_categories.product_id"
                ],
                "rows_examined_per_scan": 2,
                "rows_produced_per_join": 0,
                "filtered": "9.25",
                "not_exists": true,
                "cost_info": {
                  "read_cost": "0.09",
                  "eval_cost": "0.00",
                  "prefix_cost": "37.90",
                  "data_read_per_join": "0"
                },
                "used_columns": [
                  "product_id",
                  "price",
                  "lower_limit",
                  "usergroup_id"
                ],
                "attached_condition": "(<if>(found_match(prices_2), isnull(`pankajecarter_systemsix`.`prices_2`.`price`), true) and <if>(is_not_null_compl(prices_2), ((`pankajecarter_systemsix`.`prices_2`.`lower_limit` = 1) and (`pankajecarter_systemsix`.`prices_2`.`price` < `pankajecarter_systemsix`.`prices`.`price`) and (`pankajecarter_systemsix`.`prices_2`.`usergroup_id` in (0,0,1))), true))"
              }
            },
            {
              "table": {
                "table_name": "epd",
                "access_type": "ALL",
                "rows_examined_per_scan": 3,
                "rows_produced_per_join": 0,
                "filtered": "33.33",
                "not_exists": true,
                "using_join_buffer": "Block Nested Loop",
                "cost_info": {
                  "read_cost": "2.42",
                  "eval_cost": "0.00",
                  "prefix_cost": "40.33",
                  "data_read_per_join": "0"
                },
                "used_columns": [
                  "product_id"
                ],
                "attached_condition": "(<if>(found_match(epd), isnull(`pankajecarter_systemsix`.`epd`.`product_id`), true) and <if>(is_not_null_compl(epd), (`pankajecarter_systemsix`.`epd`.`product_id` = `pankajecarter_systemsix`.`products_categories`.`product_id`), true))"
              }
            },
            {
              "table": {
                "table_name": "descr1",
                "access_type": "eq_ref",
                "possible_keys": [
                  "PRIMARY",
                  "product_id"
                ],
                "key": "PRIMARY",
                "used_key_parts": [
                  "product_id",
                  "lang_code"
                ],
                "key_length": "9",
                "ref": [
                  "pankajecarter_systemsix.products_categories.product_id",
                  "const"
                ],
                "rows_examined_per_scan": 1,
                "rows_produced_per_join": 0,
                "filtered": "100.00",
                "cost_info": {
                  "read_cost": "0.01",
                  "eval_cost": "0.00",
                  "prefix_cost": "40.34",
                  "data_read_per_join": "37"
                },
                "used_columns": [
                  "product_id",
                  "lang_code",
                  "product",
                  "full_description"
                ]
              }
            }
          ]
        }
      }
    }
  }
}

Result

product_id product company_name price product_ids product_types parent_product_ids product_type parent_product_id full_description
135 Creative ZEN Touch 2 MP3 Player 8GB (Black) CS-Cart 0.00000000 135,135 P,P 0,0 P 0 <p>The ZEN line of portable media players has long been associated with the highest quality in audio playback, and the Creative ZEN Touch 2 continues to uphold this standard. But that's not all it offers. What makes this player truly stand out from the rest is that you can stream music wirelessly to compatible Bluetooth&reg; headphones or speakers such as Creative's ZiiSound D5 and WP-300, and surf the Internet too.</p>
138 Ridge Racer CS-Cart 0.00000000 138 P 0 P 0 <p> <p>BEAUTY &amp; HIGH SPEED DRIFTING AROUND THE WORLD!</p> <p>The high-octane racing franchise drifts onto the PlayStation&reg;Vita delivering stunning graphics and heart-pounding action that players can truly feel. Ridge Racer&reg; features high-speed action, high-performance racing machines, and all-new gameplay additions creating an edge-of-your-seat experience only possible on the PlayStation&reg;Vita. Racing fans can also take the action online and tear up the track against players from around the globe using the PlayStation&reg;Vita &ldquo;near&rdquo; and Wi-Fi functionality and race against other players&rsquo; ghosts anywhere at anytime.</p> <p> <p>Vivid, next generation high-contrast graphics and advanced lighting effects powered by the PlayStation&reg;Vita painting processor</p> <p>An immersive audio experience with a dynamic soundscape that changes and evolves with each race according to the movement of your machine.</p> <p>All-new custom drift system enables players to tune the action to suit their style of driving. All new "Machine Upgrade Map" customization allows players to upgrade functional parts and create their own original machines</p> <p>New introduction of the Planetary League allows players to join in one of four racing teams and race against other players from around the world both at real-time and "anywhere at any time" by exchanging ghosts via "near" functionality.</p> <p>Compete against up to 7 other players from around the world with online (ad-hoc, Wi-Fi) multiplayer.</p> </p> </p>
139 Shinobido 2: Revenge of Zen CS-Cart 0.00000000 139 P 0 P 0 <p> <p>Shinobido 2: Revenge of Zen is the sequel to Shinobido: Way of the Ninja, featuring the series&rsquo; trademark stealth action gameplay with the addition of new stylish assassin moves and a dynamic storyline. Developed by Acquire, the story is set six months after the events of the previous opus, with the Utakata region once again at the center of the storm and embroiled in a civil war involving the mysterious Magic Mirror. Players will take the role of Zen, a man who has suffered betrayal at the hands of his companions and the loss of his home. Saved by the Asuka clan of Utakata, Zen makes up his mind to live as an assassin and begins a perilous journey in search of revenge.</p> <p>Dynamic Storyline: Interact with three factions with different choices affecting the power balance between the factions and resulting in diverging storylines.</p> <p>Stealth action gameplay for a master assassin: Employ a variety of deadly finishing moves which vary according to the location. Activate the Zankoku for bullet-time action and use the Ninja Flying ability to freely explore environments.</p> <p>New &lsquo;near&rsquo; network features: Boost your inventory by receiving gift items from other players using the PlayStation&reg;Vita near feature.</p> <p>Original PS Vita rear touch panel gameplay features: &nbsp;Use the rear touch panel to change to a first person view and launch long range weapons at enemies.</p> </p>