SELECT 
  cscart_product_descriptions.product_id, 
  cscart_product_descriptions.short_description, 
  IF(
    cscart_product_descriptions.short_description = '' 
    OR cscart_product_descriptions.short_description IS NULL, 
    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, 
  cscart_product_descriptions.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    1199, 1943, 1901, 1200, 1212, 1939, 1211, 
    1568, 1535, 1566, 1567, 1032, 1470, 
    1573, 1917, 1916, 1491, 1496, 1497, 
    1498, 1570, 1571, 1572, 1347
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00107

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": 24,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (1199,1943,1901,1200,1212,1939,1211,1568,1535,1566,1567,1032,1470,1573,1917,1916,1491,1496,1497,1498,1570,1571,1572,1347) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
1032
1199
1200
1211
1212
1347
1470
1491
1496
1497
1498
1535
1566
1567
1568
1570
1571
1572
1573
1901
1916
1917
1939
1943