SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.search_words, 
  cscart_product_descriptions.short_description, 
  cscart_product_descriptions.full_description, 
  cscart_product_descriptions.meta_description, 
  cscart_product_descriptions.meta_keywords, 
  cscart_product_descriptions.page_title, 
  cscart_product_descriptions.promo_text, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    13860, 13439, 13440, 14041, 13441, 13876, 
    13879, 15167, 16346, 14032, 14033, 
    14034, 16334, 16348, 13442, 13443, 
    15749, 14660, 13444, 14149, 14650, 
    14024, 13896, 16347
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00034

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.04252208,
    "nested_loop": [
      {
        "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"],
          "loops": 1,
          "rows": 24,
          "cost": 0.04252208,
          "filtered": 100,
          "attached_condition": "cscart_product_descriptions.product_id in (13860,13439,13440,14041,13441,13876,13879,15167,16346,14032,14033,14034,16334,16348,13442,13443,15749,14660,13444,14149,14650,14024,13896,16347) and cscart_product_descriptions.lang_code = 'en'"
        }
      }
    ]
  }
}