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 (
    712, 693, 691, 1013, 762, 1241, 1264, 
    723, 751, 503, 628, 467, 754, 752, 655, 
    761, 1142, 1141, 1146, 721, 722, 615, 
    524, 1140, 1143, 1144, 293, 924, 750, 
    898, 565, 447, 460, 482, 1408, 1047, 
    463, 824, 521, 54, 292, 351, 343, 384, 
    340, 1139, 825, 672, 532, 623, 509, 897, 
    361, 512, 746, 740, 984, 707, 317, 745, 
    529, 834, 380, 1278, 436, 586, 596, 1075, 
    450, 743, 741, 449, 747, 1053, 415, 45, 
    1074, 1240, 431, 1244, 1050, 1052, 1089, 
    939, 889, 1107, 620, 379, 903, 316, 594, 
    533, 812, 430, 451, 614
  ) 
  AND cscart_product_descriptions.lang_code = 'en'

Query time 0.00237

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": 96,
      "filtered": 100,
      "index_condition": "cscart_product_descriptions.product_id in (712,693,691,1013,762,1241,1264,723,751,503,628,467,754,752,655,761,1142,1141,1146,721,722,615,524,1140,1143,1144,293,924,750,898,565,447,460,482,1408,1047,463,824,521,54,292,351,343,384,340,1139,825,672,532,623,509,897,361,512,746,740,984,707,317,745,529,834,380,1278,436,586,596,1075,450,743,741,449,747,1053,415,45,1074,1240,431,1244,1050,1052,1089,939,889,1107,620,379,903,316,594,533,812,430,451,614) and cscart_product_descriptions.lang_code = 'en'"
    }
  }
}

Result

product_id short_description full_description meta_keywords meta_description search_words promo_text unit_name
45
54
292
293
316
317
340
343
351
361
379
380
384
415
430
431
436
447
449
450
451
460
463
467
482
503
509
512
521
524
529
532
533
565
586
594
596
614
615
620
623
628
655
672
691
693
707
712
721
722
723
740
741
743
745
746
747
750
751
752
754
761
762
812
824
825
834
889
897
898
903
924
939
984
1013
1047
1050
1052
1053
1074
1075
1089
1107
1139
1140
1141
1142
1143
1144
1146
1240
1241
1244
1264
1278
1408