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 (
    10242, 8381, 10072, 10231, 10246, 10251, 
    10262, 10269, 10271, 10280, 10158, 
    10021, 10030, 10044, 10045, 10076, 
    10099, 10106, 10123, 10164, 10166, 
    10235, 10253, 10256, 10257, 10268, 
    10270, 10279, 10281, 10297, 9714, 10046, 
    10107, 10155, 10163, 10168, 10203, 
    10240, 10252, 10263, 10266, 10298, 
    10094, 10096, 10108, 10153, 10162, 
    10165, 10169, 10170, 10220, 10259, 
    10031, 10070, 10173, 10245, 10258, 
    10260, 10041, 10241, 10184, 10296, 
    10067, 10149, 10064
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00233

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "69.86"
    },
    "grouping_operation": {
      "using_filesort": false,
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "range",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "pt",
            "used_key_parts": [
              "product_id"
            ],
            "key_length": "3",
            "rows_examined_per_scan": 67,
            "rows_produced_per_join": 67,
            "filtered": "100.00",
            "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_products_categories`.`product_id` in (10242,8381,10072,10231,10246,10251,10262,10269,10271,10280,10158,10021,10030,10044,10045,10076,10099,10106,10123,10164,10166,10235,10253,10256,10257,10268,10270,10279,10281,10297,9714,10046,10107,10155,10163,10168,10203,10240,10252,10263,10266,10298,10094,10096,10108,10153,10162,10165,10169,10170,10220,10259,10031,10070,10173,10245,10258,10260,10041,10241,10184,10296,10067,10149,10064))",
            "cost_info": {
              "read_cost": "39.71",
              "eval_cost": "6.70",
              "prefix_cost": "46.41",
              "data_read_per_join": "1K"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ]
          }
        },
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "softwarepirmam_hewadelivard_cscart_4.cscart_products_categories.category_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 3,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "16.75",
              "eval_cost": "0.34",
              "prefix_cost": "69.86",
              "data_read_per_join": "10K"
            },
            "used_columns": [
              "category_id",
              "storefront_id",
              "usergroup_ids",
              "status"
            ],
            "attached_condition": "((`softwarepirmam_hewadelivard_cscart_4`.`cscart_categories`.`storefront_id` in (0,1)) and ((`softwarepirmam_hewadelivard_cscart_4`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`softwarepirmam_hewadelivard_cscart_4`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`softwarepirmam_hewadelivard_cscart_4`.`cscart_categories`.`usergroup_ids`))) and (`softwarepirmam_hewadelivard_cscart_4`.`cscart_categories`.`status` in ('A','H')))"
          }
        }
      ]
    }
  }
}