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 (
    2227, 2226, 2522, 2655, 2719, 2728, 3112, 
    3113, 3153, 3289, 3377, 3378, 3382, 
    3383, 3385, 3386, 3664, 3665, 3832, 
    3831, 4110, 4111, 3811, 5948, 6128, 
    6127, 6126, 6129, 6130, 6131, 6132, 
    6133, 6134, 6135, 6041, 6042, 6043, 
    6044, 6045, 6046, 6047, 6054, 6055, 
    6056, 6057, 6058, 6059, 5956, 6087, 
    6088, 6089, 6090, 6091, 6092, 6093, 
    5683, 6152, 6153, 6154, 6155, 6196, 
    6195, 6194, 6197, 6198, 6199, 6200, 
    6201, 6202
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00354

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "166.86"
    },
    "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": 187,
            "rows_produced_per_join": 187,
            "filtered": "100.00",
            "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_products_categories`.`product_id` in (2227,2226,2522,2655,2719,2728,3112,3113,3153,3289,3377,3378,3382,3383,3385,3386,3664,3665,3832,3831,4110,4111,3811,5948,6128,6127,6126,6129,6130,6131,6132,6133,6134,6135,6041,6042,6043,6044,6045,6046,6047,6054,6055,6056,6057,6058,6059,5956,6087,6088,6089,6090,6091,6092,6093,5683,6152,6153,6154,6155,6196,6195,6194,6197,6198,6199,6200,6201,6202))",
            "cost_info": {
              "read_cost": "82.71",
              "eval_cost": "18.70",
              "prefix_cost": "101.41",
              "data_read_per_join": "2K"
            },
            "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": 9,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "46.75",
              "eval_cost": "0.94",
              "prefix_cost": "166.86",
              "data_read_per_join": "29K"
            },
            "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')))"
          }
        }
      ]
    }
  }
}