SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.promo_text 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (595, 259, 273, 322, 350) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 5,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (595,259,273,322,350) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id meta_keywords meta_description search_words promo_text
259 Camera,head, ballhead, tripod, gitzo, Arca Swiss, RRS, KIRK, Wimberley, foba Fine Art Quality, Professional Ball Head Markins Q10i-BK Knob Shoe
273 Tripod, Head, Quick, Shoe, Clamp, Arca-Swiss, rrs, kirk, foba Markis QL-60 is Dovetail type lever release clamp with a spring loaded detent pin to prevent from accidental slippage. Compatible with any Arca-Swiss type camera plates from Arca, Foba, Kirk and R.R.S.
322 Camera, Tripod, Head, Quick, Shoe, Clamp, Plate, Foot, Arca-Swiss, rrs, kirk, foba Markins PC-14 is an Arca-Swiss compatible style dovetail plate for Canon EF 100-400mm f/4.5-5.6L IS II USM lens.
350
595