SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '', 
    cscart_product_descriptions.full_description, 
    ''
  ) AS full_description, 
  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 (
    5522, 5492, 5497, 5494, 5510, 5495, 5499, 
    5520, 5488, 5487, 5490, 5507, 5496, 
    5493, 5508, 5500, 5491, 5498, 5504, 
    5506, 5489, 5505, 5509, 5502
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00043

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id"],
      "key": "product_id",
      "key_length": "3",
      "used_key_parts": ["product_id"],
      "rows": 24,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (5522,5492,5497,5494,5510,5495,5499,5520,5488,5487,5490,5507,5496,5493,5508,5500,5491,5498,5504,5506,5489,5505,5509,5502)",
      "attached_condition": "cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text
5487
5488
5489
5490
5491
5492
5493
5494
5495
5496
5497
5498
5499
5500
5502
5504
5505
5506
5507
5508
5509
5510
5520
5522 <p>P10-5UH1-C5-001 - 450-512 MHz 5-10 In, 100 Out, 13.8V 25A Amplifier</p>