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 (
    4434, 4681, 4432, 4438, 4433, 4435, 4437, 
    4436, 4441, 4430, 4440, 4450, 4439, 
    4442, 4429, 4431, 4916
  ) 
  AND cscart_ult_product_descriptions.company_id = 1 
  AND cscart_ult_product_descriptions.lang_code = 'en'

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "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"],
      "rows": 17,
      "filtered": 100,
      "index_condition": "cscart_ult_product_descriptions.company_id = 1 and cscart_ult_product_descriptions.product_id in (4434,4681,4432,4438,4433,4435,4437,4436,4441,4430,4440,4450,4439,4442,4429,4431,4916) and cscart_ult_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
4429 <p>Optimum length antenna, designed for higher gain to maximize range. This rugged, stylish, capless design provides maximum flexibility and built-in capability to operate at GPS frequencies.</p> PMAD4067A, PMAD4067B, XPR 6100 Antenna, XPR 6350 Antenna, XPR 6550 Antennas
4916 PMAE4018A,