SELECT 
  product_id, 
  feature_short_desc 
FROM 
  cscart_ab__short_desc_from_features_values 
WHERE 
  product_id IN (
    18781, 18782, 18783, 18784, 18785, 18786, 
    18787, 18788, 18789, 18790, 18791, 
    18792, 18793, 18794, 18795, 18796
  ) 
  AND lang_code = 'en' 
  AND storefront_id = 1

Query time 0.00029

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 (18781,18782,18783,18784,18785,18786,18787,18788,18789,18790,18791,18792,18793,18794,18795,18796) and cscart_ab__short_desc_from_features_values.lang_code = 'en'"
    }
  }
}