SELECT 
  product_id, 
  feature_short_desc 
FROM 
  cscart_ab__short_desc_from_features_values 
WHERE 
  product_id IN (
    20589, 20590, 20591, 20592, 20593, 20594, 
    20595, 20596, 20597, 20598, 20599, 
    20600, 20601, 20602, 20603, 20604
  ) 
  AND lang_code = 'en' 
  AND storefront_id = 1

Query time 0.00024

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_ab__short_desc_from_features_values",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "attached_condition": "cscart_ab__short_desc_from_features_values.storefront_id = 1 and cscart_ab__short_desc_from_features_values.product_id in (20589,20590,20591,20592,20593,20594,20595,20596,20597,20598,20599,20600,20601,20602,20603,20604) and cscart_ab__short_desc_from_features_values.lang_code = 'en'"
    }
  }
}