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 (
    5032, 5035, 5028, 5030, 5029, 5040, 5036, 
    5461, 10221, 5034, 5042, 5458, 5328, 
    5043, 5047, 5044, 6085, 5502, 5050, 
    5365, 5033, 6016, 5049, 6017, 5456, 
    5596, 5367, 5500, 5333, 5594, 5054, 
    6084, 6191, 5363, 5335, 5504, 5506, 
    6018, 5464, 6185
  )

Query time 0.00117

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "59.46"
    },
    "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": 43,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "index_condition": "(`softwarepirmam_hewadelivard_cscart_4`.`p`.`product_id` in (5032,5035,5028,5030,5029,5040,5036,5461,10221,5034,5042,5458,5328,5043,5047,5044,6085,5502,5050,5365,5033,6016,5049,6017,5456,5596,5367,5500,5333,5594,5054,6084,6191,5363,5335,5504,5506,6018,5464,6185))",
          "cost_info": {
            "read_cost": "25.06",
            "eval_cost": "4.30",
            "prefix_cost": "29.36",
            "data_read_per_join": "688"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ]
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.75",
            "eval_cost": "4.30",
            "prefix_cost": "44.41",
            "data_read_per_join": "16K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      },
      {
        "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": [
            "softwarepirmam_hewadelivard_cscart_4.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 43,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "10.75",
            "eval_cost": "4.30",
            "prefix_cost": "59.46",
            "data_read_per_join": "4K"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ]
        }
      }
    ]
  }
}