SELECT 
  feature_id, 
  feature_type 
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 (18, 549, 548)

Query time 0.00013

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.00779616,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_product_features",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["feature_id"],
          "loops": 1,
          "rows": 3,
          "cost": 0.00429364,
          "filtered": 100,
          "attached_condition": "cscart_product_features.feature_id in (18,549,548)"
        }
      },
      {
        "table": {
          "table_name": "cscart_ult_objects_sharing",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "159",
          "used_key_parts": [
            "share_object_id",
            "share_company_id",
            "share_object_type"
          ],
          "ref": ["lvshop.cscart_product_features.feature_id", "const", "const"],
          "loops": 3,
          "rows": 1,
          "cost": 0.00350252,
          "filtered": 100,
          "attached_condition": "cscart_ult_objects_sharing.share_object_id = cscart_product_features.feature_id and cscart_ult_objects_sharing.share_object_type = 'product_features'"
        }
      }
    ]
  }
}