SELECT 
  f.feature_id, 
  f.purpose, 
  p.product_id, 
  p.parent_product_id, 
  g.id, 
  g.code 
FROM 
  cscart_product_variation_group_features AS f 
  INNER JOIN cscart_product_variation_groups AS g ON f.group_id = g.id 
  INNER JOIN cscart_product_variation_group_products AS p ON f.group_id = p.group_id 
WHERE 
  p.product_id IN (
    121, 119, 141, 23, 4, 142, 120, 62, 108, 
    107, 94, 8, 86, 54, 10, 93, 12, 32, 7, 130, 
    35, 16, 33, 110, 34, 89, 147, 114, 36, 
    128, 20, 52, 84, 109, 118, 19, 131, 146, 
    13, 61, 95, 15, 9, 85, 59, 111, 144, 60, 
    123, 145, 113, 6, 14, 63, 136, 50984, 
    127, 134, 42, 50985, 50986, 50988, 50993, 
    50992
  )

Query time 0.00127

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "89.61"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "range",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "product_id"
          ],
          "key_length": "3",
          "rows_examined_per_scan": 64,
          "rows_produced_per_join": 64,
          "filtered": "100.00",
          "index_condition": "(`test_uchur_k`.`p`.`product_id` in (121,119,141,23,4,142,120,62,108,107,94,8,86,54,10,93,12,32,7,130,35,16,33,110,34,89,147,114,36,128,20,52,84,109,118,19,131,146,13,61,95,15,9,85,59,111,144,60,123,145,113,6,14,63,136,50984,127,134,42,50985,50986,50988,50993,50992))",
          "cost_info": {
            "read_cost": "38.41",
            "eval_cost": "6.40",
            "prefix_cost": "44.81",
            "data_read_per_join": "1024"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ref",
          "possible_keys": [
            "idx_group_id"
          ],
          "key": "idx_group_id",
          "used_key_parts": [
            "group_id"
          ],
          "key_length": "3",
          "ref": [
            "test_uchur_k.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 64,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "16.00",
            "eval_cost": "6.40",
            "prefix_cost": "67.21",
            "data_read_per_join": "6K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "test_uchur_k.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 64,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "16.00",
            "eval_cost": "6.40",
            "prefix_cost": "89.61",
            "data_read_per_join": "25K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      }
    ]
  }
}