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.unit_name 
FROM 
  cscart_product_descriptions 
WHERE 
  cscart_product_descriptions.product_id IN (
    19405, 19406, 19407, 19408, 19409, 19410, 
    19411, 19412, 19413, 19414, 19415, 
    19416, 19417, 19418, 19419, 19420
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "cscart_product_descriptions",
      "access_type": "range",
      "possible_keys": ["PRIMARY", "product_id", "idx_product_lang"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["product_id", "lang_code"],
      "rows": 16,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (19405,19406,19407,19408,19409,19410,19411,19412,19413,19414,19415,19416,19417,19418,19419,19420) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19405 Lamp assembly-head, right<p>Part number 92102G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19406 Subassembly - headlamp, left<p>Part number 92103G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19407 Subassembly - headlamp, right<p>Part number 92104G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19408 LED Driver Module-Headlamp<p>Part number 92180G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19409 Garnish-rear combination lamp, left<p>Part number 92435G9500UYH</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19410 Garnish-rear combination lamp, right<p>Part number 92436G9500UYH</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19411 latch<p>Part number 92835G9000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19412 Lamp Assembly - Overhead Console<p>Part number 92800G9000NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19413 Switch Assembly - Side Crash Pad<p>Part number 93700G9AA0NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19414 Cluster Assembly - Instrumentation<p>Part number 94063G9050</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19415 Unit assembly-integrated body control module<p>Part number 95400G9GH2</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19416 Unit assembly - front radar<p>Part number 99110G9200</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19417 T/M control unit<p>Part number 9544047000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19418 Antenna Assembly - Combination<p>Part number 96210G9150UYH</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19419 Sil-Blower TO Evaporator<p>Part number 97246J5000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19420 Case-Blower, Top<p>Part number 97111G9000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>