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, 
  product_position_source.position AS position 
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') 
  LEFT JOIN cscart_products_categories AS product_position_source ON cscart_products_categories.product_id = product_position_source.product_id 
  AND product_position_source.category_id = 7339 
WHERE 
  cscart_products_categories.product_id IN (
    92512, 92520, 92522, 84280, 84285, 84288, 
    84954, 84048, 92515, 92516, 92519, 
    84278, 84279, 84283, 84284, 84287, 
    92510, 92517, 92521, 84956, 92550, 
    92509, 92511, 92518, 84047, 84277, 
    84282, 92514, 92549, 85010, 92542, 
    92543, 84273, 84275, 84955, 84276, 
    84281, 84286, 85011, 92513, 92545, 
    92546, 92547, 92544, 92548, 84272, 
    84274, 84046, 84049, 92541, 92508, 
    94956, 94957, 95655, 95656, 95657, 
    95658, 95659, 95660, 96698, 96699, 
    96700, 96701, 96702, 96703, 96704, 
    96705, 101036
  ) 
GROUP BY 
  cscart_products_categories.product_id

Query time 0.01616

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "128.89"
    },
    "grouping_operation": {
      "using_temporary_table": true,
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "5.29"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "cscart_categories",
            "access_type": "ALL",
            "possible_keys": [
              "PRIMARY",
              "c_status",
              "p_category_id"
            ],
            "rows_examined_per_scan": 208,
            "rows_produced_per_join": 8,
            "filtered": "4.00",
            "cost_info": {
              "read_cost": "20.72",
              "eval_cost": "0.83",
              "prefix_cost": "21.55",
              "data_read_per_join": "21K"
            },
            "used_columns": [
              "category_id",
              "usergroup_ids",
              "status",
              "storefront_id"
            ],
            "attached_condition": "((`nuie_scalesta_net`.`cscart_categories`.`storefront_id` in (0,1)) and ((`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids` = '') or (0 <> find_in_set(0,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`)) or (0 <> find_in_set(1,`nuie_scalesta_net`.`cscart_categories`.`usergroup_ids`))) and (`nuie_scalesta_net`.`cscart_categories`.`status` in ('A','H')))"
          }
        },
        {
          "table": {
            "table_name": "cscart_products_categories",
            "access_type": "ref",
            "possible_keys": [
              "PRIMARY",
              "link_type",
              "pt"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id"
            ],
            "key_length": "3",
            "ref": [
              "nuie_scalesta_net.cscart_categories.category_id"
            ],
            "rows_examined_per_scan": 117,
            "rows_produced_per_join": 5,
            "filtered": "0.54",
            "cost_info": {
              "read_cost": "2.33",
              "eval_cost": "0.53",
              "prefix_cost": "121.75",
              "data_read_per_join": "84"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "link_type"
            ],
            "attached_condition": "(`nuie_scalesta_net`.`cscart_products_categories`.`product_id` in (92512,92520,92522,84280,84285,84288,84954,84048,92515,92516,92519,84278,84279,84283,84284,84287,92510,92517,92521,84956,92550,92509,92511,92518,84047,84277,84282,92514,92549,85010,92542,92543,84273,84275,84955,84276,84281,84286,85011,92513,92545,92546,92547,92544,92548,84272,84274,84046,84049,92541,92508,94956,94957,95655,95656,95657,95658,95659,95660,96698,96699,96700,96701,96702,96703,96704,96705,101036))"
          }
        },
        {
          "table": {
            "table_name": "product_position_source",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY",
              "pt"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "category_id",
              "product_id"
            ],
            "key_length": "6",
            "ref": [
              "const",
              "nuie_scalesta_net.cscart_products_categories.product_id"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 5,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "1.32",
              "eval_cost": "0.53",
              "prefix_cost": "123.60",
              "data_read_per_join": "84"
            },
            "used_columns": [
              "product_id",
              "category_id",
              "position"
            ]
          }
        }
      ]
    }
  }
}