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 (
    3112, 3944, 3664, 3126, 2230, 2655, 3741, 
    5683, 3440, 5890, 2226, 5859, 3843, 
    3840, 3130, 3441, 3811, 6054, 2221, 
    5891, 3153, 3924, 3377, 2522, 2719, 
    6041, 5111, 3385, 5948, 8240, 3551, 
    3831, 5927, 3289, 10078, 3382, 3519, 
    3356, 6093, 6194
  )

Query time 0.00097

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 (3112,3944,3664,3126,2230,2655,3741,5683,3440,5890,2226,5859,3843,3840,3130,3441,3811,6054,2221,5891,3153,3924,3377,2522,2719,6041,5111,3385,5948,8240,3551,3831,5927,3289,10078,3382,3519,3356,6093,6194))",
          "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"
          ]
        }
      }
    ]
  }
}