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 (
    10991, 10992, 11025, 11024, 11081, 11080, 
    11082, 11086, 11085, 11137, 11136, 
    11152, 11153, 11236, 11237, 11300, 
    11301, 11306, 11307, 11337, 11338, 
    11348, 11349, 11352, 11355, 11360, 
    11361, 11362, 11363, 11364, 11365, 
    11388, 11389, 11390, 11391, 11399, 
    11400, 11411, 11412, 11413, 11416, 
    11415, 11414, 11417, 11430, 11431, 
    11439, 11441, 11445, 11446, 11447, 
    11448, 11453, 11454, 11455, 11458, 
    11460, 11462, 11463, 11472, 11474, 
    11475, 11477, 11478, 11480, 11479, 
    11481, 11508, 11509, 11520, 11521, 
    11522, 11523, 11530, 11532, 11531, 
    11533, 11534, 11535, 11536, 11598, 
    11599, 11600, 11633, 11634, 11635, 
    11636
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.00217

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "562.56"
    },
    "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": 676,
            "rows_produced_per_join": 676,
            "filtered": "100.00",
            "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`cscart_products_categories`.`product_id` in (10991,10992,11025,11024,11081,11080,11082,11086,11085,11137,11136,11152,11153,11236,11237,11300,11301,11306,11307,11337,11338,11348,11349,11352,11355,11360,11361,11362,11363,11364,11365,11388,11389,11390,11391,11399,11400,11411,11412,11413,11416,11415,11414,11417,11430,11431,11439,11441,11445,11446,11447,11448,11453,11454,11455,11458,11460,11462,11463,11472,11474,11475,11477,11478,11480,11479,11481,11508,11509,11520,11521,11522,11523,11530,11532,11531,11533,11534,11535,11536,11598,11599,11600,11633,11634,11635,11636))",
            "cost_info": {
              "read_cost": "258.36",
              "eval_cost": "67.60",
              "prefix_cost": "325.96",
              "data_read_per_join": "10K"
            },
            "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": 33,
            "filtered": "5.00",
            "cost_info": {
              "read_cost": "169.00",
              "eval_cost": "3.38",
              "prefix_cost": "562.56",
              "data_read_per_join": "105K"
            },
            "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')))"
          }
        }
      ]
    }
  }
}