Sandbox

SELECT 
  SQL_CALC_FOUND_ROWS products.product_id, 
  descr1.product as product, 
  companies.company as company_name, 
  products.product_type, 
  products.parent_product_id 
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_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) 
WHERE 
  1 
  AND companies.status IN ('A') 
  AND products.company_id = 1 
  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 products.company_id = 1 
  AND products.parent_product_id = 0 
  AND products.product_type != 'D' 
GROUP BY 
  products.product_id 
ORDER BY 
  product asc, 
  products.product_id ASC 
LIMIT 
  128, 64

Query time 0.00317

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "34.62"
    },
    "ordering_operation": {
      "using_filesort": true,
      "grouping_operation": {
        "using_temporary_table": true,
        "using_filesort": false,
        "nested_loop": [
          {
            "table": {
              "table_name": "companies",
              "access_type": "const",
              "possible_keys": [
                "PRIMARY"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "company_id"
              ],
              "key_length": "4",
              "ref": [
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 1,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.00",
                "eval_cost": "0.20",
                "prefix_cost": "0.00",
                "data_read_per_join": "6K"
              },
              "used_columns": [
                "company_id",
                "status",
                "company"
              ]
            }
          },
          {
            "table": {
              "table_name": "cscart_categories",
              "access_type": "ALL",
              "possible_keys": [
                "PRIMARY",
                "c_status",
                "p_category_id"
              ],
              "rows_examined_per_scan": 84,
              "rows_produced_per_join": 3,
              "filtered": "4.00",
              "cost_info": {
                "read_cost": "19.52",
                "eval_cost": "0.67",
                "prefix_cost": "20.20",
                "data_read_per_join": "8K"
              },
              "used_columns": [
                "category_id",
                "storefront_id",
                "usergroup_ids",
                "status"
              ],
              "attached_condition": "(((`pankajecarter_systemfour`.`cscart_categories`.`usergroup_ids` = '') or find_in_set(0,`pankajecarter_systemfour`.`cscart_categories`.`usergroup_ids`) or find_in_set(1,`pankajecarter_systemfour`.`cscart_categories`.`usergroup_ids`)) and (`pankajecarter_systemfour`.`cscart_categories`.`status` in ('A','H')) and (`pankajecarter_systemfour`.`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_systemfour.cscart_categories.category_id"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 6,
              "filtered": "100.00",
              "using_index": true,
              "cost_info": {
                "read_cost": "3.50",
                "eval_cost": "1.34",
                "prefix_cost": "25.04",
                "data_read_per_join": "107"
              },
              "used_columns": [
                "product_id",
                "category_id"
              ]
            }
          },
          {
            "table": {
              "table_name": "products",
              "access_type": "eq_ref",
              "possible_keys": [
                "PRIMARY",
                "status",
                "idx_parent_product_id"
              ],
              "key": "PRIMARY",
              "used_key_parts": [
                "product_id"
              ],
              "key_length": "3",
              "ref": [
                "pankajecarter_systemfour.products_categories.product_id"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "8.53",
              "cost_info": {
                "read_cost": "6.72",
                "eval_cost": "0.11",
                "prefix_cost": "33.10",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "product_id",
                "product_type",
                "status",
                "company_id",
                "usergroup_ids",
                "parent_product_id"
              ],
              "attached_condition": "((`pankajecarter_systemfour`.`products`.`parent_product_id` = 0) and (`pankajecarter_systemfour`.`products`.`company_id` = 1) and ((`pankajecarter_systemfour`.`products`.`usergroup_ids` = '') or find_in_set(0,`pankajecarter_systemfour`.`products`.`usergroup_ids`) or find_in_set(1,`pankajecarter_systemfour`.`products`.`usergroup_ids`)) and (`pankajecarter_systemfour`.`products`.`status` = 'A') and (`pankajecarter_systemfour`.`products`.`product_type` <> 'D'))"
            }
          },
          {
            "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_systemfour.products_categories.product_id",
                "const"
              ],
              "rows_examined_per_scan": 1,
              "rows_produced_per_join": 0,
              "filtered": "100.00",
              "cost_info": {
                "read_cost": "0.57",
                "eval_cost": "0.11",
                "prefix_cost": "33.79",
                "data_read_per_join": "2K"
              },
              "used_columns": [
                "product_id",
                "lang_code",
                "product"
              ]
            }
          },
          {
            "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_systemfour.products_categories.product_id"
              ],
              "rows_examined_per_scan": 2,
              "rows_produced_per_join": 1,
              "filtered": "92.52",
              "using_index": true,
              "cost_info": {
                "read_cost": "0.60",
                "eval_cost": "0.21",
                "prefix_cost": "34.62",
                "data_read_per_join": "25"
              },
              "used_columns": [
                "product_id",
                "lower_limit",
                "usergroup_id"
              ],
              "attached_condition": "((`pankajecarter_systemfour`.`prices`.`lower_limit` = 1) and (`pankajecarter_systemfour`.`prices`.`usergroup_id` in (0,0,1)))"
            }
          }
        ]
      }
    }
  }
}

Result

product_id	product	company_name	product_type
26	Mac OS X Lion: The Missing Manual	CS-Cart	P
35	Managing Enterprise Content: A Unified Content Strategy, 2nd Edition	CS-Cart	P
47	MARVEL® VS. CAPCOM® 3: FATE OF TWO WORLDS SPECIAL EDITION (PS3)	CS-Cart	P
81	Minnetonka Original Cowhide Driving Moc	CS-Cart	P
107	Montblanc Classic Collection Money Clip	CS-Cart	P
109	Montblanc Contemporary Collection Key Ring with Montblanc emblem	CS-Cart	P
91	Montblanc Nicolas Rieussec Chronograph Automatic	CS-Cart	P
92	Montblanc TimeWalker Automatic	CS-Cart	P
161	MV800 16.1 Megapixel MultiView Compact Digital Camera	CS-Cart	P
188	NEW Wilson Staff Fifty Elite Yellow Golf Ball	CS-Cart	P
202	New Year's Concert 2011 Diverse Klassik Welser-moest / Wiener Philharmoniker	CS-Cart	P
203	New Year's Concert 2012 Diverse Wr.Philharmoniker / Jansons,M. / Wr.Sän	CS-Cart	P
34	Nike "Untouchable" Women's Tank Top	CS-Cart	P
31	Nike Classic Solid Women's Jersey Shorts	CS-Cart	P
38	Nike Futura Unravel Women's T-Shirt	CS-Cart	P
80	Nike Tenkay Slip TXTL Women's Shoe	CS-Cart	P
165	Nikon 1 J1 One-Lens Kit White	CS-Cart	P
166	Nikon 1 J1 Two-Lens Wide Angle Kit Red	CS-Cart	P
86	Nokia 700	CS-Cart	P
106	Nokia E5-00	CS-Cart	P
105	Nokia Lumia 800	CS-Cart	P
247	Nokia N1 Pad 7.9" Quad-Core 64bit 2.3GHz 2GB 32GB Android 5.0	CS-Cart	P
101	Nokia X3-02	CS-Cart	P
33	nüvi® 2455LT	CS-Cart	P
32	nüvi® 3450	CS-Cart	P
163	NX200 20.3 Megapixel Compact System Camera	CS-Cart	P
244	Packard Bell OneTwo	CS-Cart	P
212	Panasonic KX-MB2000 24PPM 3-in-1 Monochrome Laser MFP	CS-Cart	P
155	Porta Pro KTC On-Ear Headphone	CS-Cart	P
102	PR 100 Women's White Quartz Watch	CS-Cart	P
55	PRS-D800	CS-Cart	P
176	Quartet® Euro™ Magnetic Porcelain Total Erase® Mobile Easel	CS-Cart	P
69	Rhyme	CS-Cart	P
138	Ridge Racer	CS-Cart	P
110	Roots 30th Anniversary Special Edition (DVD)	CS-Cart	P
36	Routing Protocols and Concepts: CCNA Exploration Companion Guide	CS-Cart	P
206	RT-N66U Dual-Band Wireless-N900 Gigabit Router	CS-Cart	P
28	Run Perf 7/8 Ti	CS-Cart	P
184	Samsung 30mm NX Pancake Lens	CS-Cart	P
183	Samsung 50-200mm NX Telephoto OIS Lens	CS-Cart	P
133	Samsung Galaxy Player 4.0	CS-Cart	P
132	Samsung Galaxy Player 5.0	CS-Cart	P
125	Samsung Galaxy S II	CS-Cart	P
120	Samsung Galaxy S II, Epic 4G Touch (Black)	CS-Cart	P
223	Samsung Galaxy Tab 8.9 (Wi-Fi Only) - 32GB Metallic Gray	CS-Cart	P
225	Samsung Galaxy Tab™ 7.0" (Verizon)	CS-Cart	P
224	Samsung Galaxy Tab™ 8.9 (AT&T)	CS-Cart	P
146	Sansa Clip+ MP3 Player (Blue) - 4GB	CS-Cart	P
147	Sansa Clip+ MP3 Player (Red) - 4GB	CS-Cart	P
93	Scene It? Bright Lights! Big Screen(X360)	CS-Cart	P
117	SCH-I515	CS-Cart	P
219	Series 3 15.6" Laptop	CS-Cart	P
222	Series 3 15.6" Laptop	CS-Cart	P
220	Series 7 Chronos 14” Notebook	CS-Cart	P
221	Series 9 13.3" Laptop	CS-Cart	P
87	Sesame Street:Cookie's Counting Carnival (Wii)	CS-Cart	P
113	SGH-I677	CS-Cart	P
139	Shinobido 2: Revenge of Zen	CS-Cart	P
118	Smallville: The Complete Tenth Season	CS-Cart	P
83	Speed Racer: The Videogame (Wii)	CS-Cart	P
157	Studio Monitor Headphones	CS-Cart	P
123	Supernatural: The Complete Sixth Season	CS-Cart	P
174	Swingline® Optima® 20 Electric Stapler	CS-Cart	P
171	Swingline™ Stack-and-Shred™ 100X Hands Free Shredder	CS-Cart	P