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 (
    728, 96, 141, 95, 149, 148, 150, 133, 132, 
    131, 94, 385, 138, 137, 139, 127, 128, 
    130, 101, 146, 124, 125, 622, 481, 760, 
    346, 371, 353, 494, 522, 479, 458, 442, 
    432, 441, 439, 480, 440, 364, 338, 383, 
    419, 352, 682, 81, 50, 306, 817
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00159

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": 48,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (728,96,141,95,149,148,150,133,132,131,94,385,138,137,139,127,128,130,101,146,124,125,622,481,760,346,371,353,494,522,479,458,442,432,441,439,480,440,364,338,383,419,352,682,81,50,306,817) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
50
81
94
95
96
101
124
125
127
128
130
131
132
133
137
138
139
141
146
148
149
150
306
338
346
352
353
364
371
383
385
419
432
439
440
441
442
458
479
480
481
494
522
622
682
728
760
817