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 (
    19533, 19534, 19535, 19536, 19537, 19538, 
    19539, 19540, 19541, 19542, 19543, 
    19544, 19545, 19546, 19547, 19548
  ) 
  AND cscart_product_descriptions.lang_code = 'ru'

Query time 0.00215

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 (19533,19534,19535,19536,19537,19538,19539,19540,19541,19542,19543,19544,19545,19546,19547,19548) and cscart_product_descriptions.lang_code = 'ru'"
    }
  }
}

Result

product_id short_description full_description unit_name
19533 Complete-Console Follower Switch<p>Part number 93300G9AA0</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19534 Unit Assembly - Wireless Charging<p>Part number 95560G9610</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19535 Charger Assembly-USB<p>Part number 96125T6000NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19536 Cover assembly - top of glove box<p>Part number 84540G9AA0NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19537 Crash pad assembly-main<p>Part number 84710G9AB0NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19538 Shroud-lower steering column<p>Part number 84855G9201NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19539 Switch Assemblies - Tilt & Telescopic<p>Part number 93691J5000</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19540 Sun visor assembly, left<p>Part number 85210G9BA0VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19541 Sun visor assembly, right<p>Part number 85220G9BB0VNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19542 Wiring assembly - loop<p>Part number 91831G9300</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19543 Board assembly - luggage covering<p>Part number 85715G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19544 Rear side net, left<p>Part number 85739G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19545 Rear side net right side<p>Part number 85749G9500</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19546 Trim assembly - luggage side, left<p>Part number 85730G9501NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19547 Trim assembly - luggage side, right<p>Part number 85740G9530NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>
19548 Tray-luggage, center<p>Part number 85750G9510NNB</p><p>If you are not sure about compatibility, please contact us in advance to confirm the part number.</p>