SELECT 
  product_id, 
  feature_short_desc 
FROM 
  cscart_ab__short_desc_from_features_values 
WHERE 
  product_id IN (
    21647, 21648, 21649, 21650, 21651, 21652, 
    21653, 21654, 21655, 21656, 21657, 
    21658, 21659, 21660, 21661, 21662
  ) 
  AND lang_code = 'ru' 
  AND storefront_id = 1

Query time 0.00266

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": 32,
      "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 (21647,21648,21649,21650,21651,21652,21653,21654,21655,21656,21657,21658,21659,21660,21661,21662) and cscart_ab__short_desc_from_features_values.lang_code = 'ru'"
    }
  }
}