SELECT 
  cscart_ult_product_descriptions.product_id, 
  cscart_ult_product_descriptions.short_description, 
  IF(
    cscart_ult_product_descriptions.short_description = "", 
    cscart_ult_product_descriptions.full_description, 
    ""
  ) AS full_description, 
  cscart_ult_product_descriptions.meta_keywords, 
  cscart_ult_product_descriptions.meta_description, 
  cscart_ult_product_descriptions.search_words, 
  cscart_ult_product_descriptions.promo_text 
FROM 
  cscart_ult_product_descriptions 
WHERE 
  cscart_ult_product_descriptions.product_id IN (292, 293, 291, 290, 289, 288) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.00876626,
    "nested_loop": [
      {
        "table": {
          "table_name": "cscart_ult_product_descriptions",
          "access_type": "range",
          "possible_keys": ["PRIMARY", "product_id", "company_id"],
          "key": "PRIMARY",
          "key_length": "13",
          "used_key_parts": ["product_id", "lang_code", "company_id"],
          "loops": 1,
          "rows": 6,
          "cost": 0.00876626,
          "filtered": 100,
          "attached_condition": "cscart_ult_product_descriptions.company_id = 1 and cscart_ult_product_descriptions.product_id in (292,293,291,290,289,288) and cscart_ult_product_descriptions.lang_code = 'en'"
        }
      }
    ]
  }
}