SELECT 
  feature_id 
FROM 
  cscart_product_features 
  INNER JOIN cscart_ult_objects_sharing ON (
    cscart_ult_objects_sharing.share_object_id = cscart_product_features.feature_id 
    AND cscart_ult_objects_sharing.share_company_id = 1 
    AND cscart_ult_objects_sharing.share_object_type = 'product_features'
  ) 
WHERE 
  feature_id IN (
    640, 621, 594, 613, 595, 550, 628, 624, 
    625, 626, 622, 623, 605, 606, 627, 639, 
    634, 636, 629, 631, 633
  ) 
  AND feature_type = 'E'

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "6.58"
    },
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features",
          "access_type": "ALL",
          "possible_keys": [
            "PRIMARY"
          ],
          "rows_examined_per_scan": 51,
          "rows_produced_per_join": 2,
          "filtered": "4.12",
          "cost_info": {
            "read_cost": "5.63",
            "eval_cost": "0.21",
            "prefix_cost": "5.84",
            "data_read_per_join": "2K"
          },
          "used_columns": [
            "feature_id",
            "feature_type"
          ],
          "attached_condition": "((`gaseus`.`cscart_product_features`.`feature_id` in (640,621,594,613,595,550,628,624,625,626,622,623,605,606,627,639,634,636,629,631,633)) and (`gaseus`.`cscart_product_features`.`feature_type` = 'E'))"
        }
      },
      {
        "table": {
          "table_name": "cscart_ult_objects_sharing",
          "access_type": "eq_ref",
          "possible_keys": [
            "PRIMARY"
          ],
          "key": "PRIMARY",
          "used_key_parts": [
            "share_object_id",
            "share_company_id",
            "share_object_type"
          ],
          "key_length": "159",
          "ref": [
            "gaseus.cscart_product_features.feature_id",
            "const",
            "const"
          ],
          "rows_examined_per_scan": 1,
          "rows_produced_per_join": 2,
          "filtered": "100.00",
          "using_index": true,
          "cost_info": {
            "read_cost": "0.53",
            "eval_cost": "0.21",
            "prefix_cost": "6.58",
            "data_read_per_join": "336"
          },
          "used_columns": [
            "share_company_id",
            "share_object_id",
            "share_object_type"
          ],
          "attached_condition": "(`gaseus`.`cscart_ult_objects_sharing`.`share_object_id` = `gaseus`.`cscart_product_features`.`feature_id`)"
        }
      }
    ]
  }
}