SELECT 
  cscart_products_categories.product_id, 
  GROUP_CONCAT(
    IF(
      cscart_products_categories.link_type = "M", 
      CONCAT(
        cscart_products_categories.category_id, 
        "M"
      ), 
      cscart_products_categories.category_id
    )
  ) AS category_ids 
FROM 
  cscart_products_categories 
  INNER JOIN cscart_categories ON cscart_categories.category_id = cscart_products_categories.category_id 
  AND cscart_categories.storefront_id IN (0, 1) 
  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') 
WHERE 
  cscart_products_categories.product_id IN (
    211, 
    210, 
    209, 
    67, 
    25, 
    116, 
    213, 
    215, 
    226, 
    200, 
    154, 
    53, 
    52, 
    111, 
    82, 
    84, 
    228, 
    85, 
    88, 
    287, 
    315, 
    26, 
    35, 
    47, 
    81, 
    107, 
    109, 
    91, 
    92, 
    161, 
    188, 
    202, 
    203, 
    34, 
    31, 
    38, 
    80, 
    165, 
    166, 
    86, 
    106, 
    105, 
    247, 
    101, 
    33, 
    32, 
    163, 
    244, 
    212, 
    155, 
    102, 
    55, 
    176, 
    69, 
    138, 
    110, 
    36, 
    206, 
    28, 
    184, 
    183, 
    133, 
    132, 
    125, 
    120, 
    223, 
    225, 
    224, 
    146, 
    147, 
    93, 
    117, 
    219, 
    222, 
    220, 
    221, 
    87, 
    113, 
    139, 
    118, 
    83, 
    157, 
    286, 
    123, 
    174, 
    171, 
    280, 
    282, 
    278, 
    331, 
    335, 
    339, 
    341, 
    355, 
    356, 
    357, 
    358, 
    359, 
    360, 
    361, 
    362, 
    363, 
    364, 
    365, 
    366, 
    367, 
    368, 
    369, 
    370, 
    379, 
    380, 
    381, 
    382, 
    383, 
    384, 
    385, 
    386, 
    387, 
    388, 
    389, 
    390, 
    391, 
    392, 
    393, 
    394, 
    395, 
    396, 
    397
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00147

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "39.08"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "3.53"
      },
      "nested_loop": [
        {
          "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": "19.53",
              "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`.`storefront_id` in (0,1)) and ((`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')))"
          }
        },
        {
          "table": {
            "table_name": "cscart_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": 3,
            "rows_produced_per_join": 3,
            "filtered": "35.01",
            "index_condition": "(`pankajecarter_systemfour`.`cscart_products_categories`.`product_id` in (211,210,209,67,25,116,213,215,226,200,154,53,52,111,82,84,228,85,88,287,315,26,35,47,81,107,109,91,92,161,188,202,203,34,31,38,80,165,166,86,106,105,247,101,33,32,163,244,212,155,102,55,176,69,138,110,36,206,28,184,183,133,132,125,120,223,225,224,146,147,93,117,219,222,220,221,87,113,139,118,83,157,286,123,174,171,280,282,278,331,335,339,341,355,356,357,358,359,360,361,362,363,364,365,366,367,368,369,370,379,380,381,382,383,384,385,386,387,388,389,390,391,392,393,394,395,396,397))",
            "cost_info": {
              "read_cost": "13.34",
              "eval_cost": "0.71",
              "prefix_cost": "35.55",
              "data_read_per_join": "56"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ]
          }
        }
      ]
    }
  }
}