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 (78, 79, 11, 41, 28, 7, 27)

Query time 0.00052

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "16.30"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "p",
          "access_type": "ALL",
          "possible_keys": [
            "PRIMARY",
            "idx_group_id"
          ],
          "rows_examined_per_scan": 14,
          "rows_produced_per_join": 7,
          "filtered": "50.00",
          "cost_info": {
            "read_cost": "3.44",
            "eval_cost": "1.40",
            "prefix_cost": "4.84",
            "data_read_per_join": "112"
          },
          "used_columns": [
            "product_id",
            "parent_product_id",
            "group_id"
          ],
          "attached_condition": "(`pankajecarter_systemfive`.`p`.`product_id` in (78,79,11,41,28,7,27))"
        }
      },
      {
        "table": {
          "table_name": "f",
          "access_type": "ALL",
          "possible_keys": [
            "idx_group_id"
          ],
          "rows_examined_per_scan": 5,
          "rows_produced_per_join": 7,
          "filtered": "20.00",
          "using_join_buffer": "Block Nested Loop",
          "cost_info": {
            "read_cost": "2.06",
            "eval_cost": "1.40",
            "prefix_cost": "13.90",
            "data_read_per_join": "728"
          },
          "used_columns": [
            "feature_id",
            "purpose",
            "group_id"
          ],
          "attached_condition": "(`pankajecarter_systemfive`.`f`.`group_id` = `pankajecarter_systemfive`.`p`.`group_id`)"
        }
      },
      {
        "table": {
          "table_name": "g",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "id"
          ],
          "key_length": "3",
          "ref": [
            "pankajecarter_systemfive.p.group_id"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 7,
          "filtered": "100.00",
          "cost_info": {
            "read_cost": "1.00",
            "eval_cost": "1.40",
            "prefix_cost": "16.30",
            "data_read_per_join": "2K"
          },
          "used_columns": [
            "id",
            "code"
          ]
        }
      }
    ]
  }
}