SELECT 
  lang.name, 
  lang.value 
FROM 
  cscart_language_values lang 
WHERE 
  lang.lang_code = 'en' 
  AND lang.name IN (
    'calendar', 'weekday_abr_0', 'weekday_abr_1', 
    'weekday_abr_2', 'weekday_abr_3', 
    'weekday_abr_4', 'weekday_abr_5', 
    'weekday_abr_6', 'month_name_abr_1', 
    'month_name_abr_2', 'month_name_abr_3', 
    'month_name_abr_4', 'month_name_abr_5', 
    'month_name_abr_6', 'month_name_abr_7', 
    'month_name_abr_8', 'month_name_abr_9', 
    'month_name_abr_10', 'month_name_abr_11', 
    'month_name_abr_12', 'calendar', 
    'weekday_abr_0', 'weekday_abr_1', 
    'weekday_abr_2', 'weekday_abr_3', 
    'weekday_abr_4', 'weekday_abr_5', 
    'weekday_abr_6', 'month_name_abr_1', 
    'month_name_abr_2', 'month_name_abr_3', 
    'month_name_abr_4', 'month_name_abr_5', 
    'month_name_abr_6', 'month_name_abr_7', 
    'month_name_abr_8', 'month_name_abr_9', 
    'month_name_abr_10', 'month_name_abr_11', 
    'month_name_abr_12'
  )

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost": 0.03556692,
    "nested_loop": [
      {
        "table": {
          "table_name": "lang",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "392",
          "used_key_parts": ["lang_code", "name"],
          "loops": 1,
          "rows": 20,
          "cost": 0.03556692,
          "filtered": 100,
          "attached_condition": "lang.lang_code = 'en' and lang.`name` in ('calendar','weekday_abr_0','weekday_abr_1','weekday_abr_2','weekday_abr_3','weekday_abr_4','weekday_abr_5','weekday_abr_6','month_name_abr_1','month_name_abr_2','month_name_abr_3','month_name_abr_4','month_name_abr_5','month_name_abr_6','month_name_abr_7','month_name_abr_8','month_name_abr_9','month_name_abr_10','month_name_abr_11','month_name_abr_12','calendar','weekday_abr_0','weekday_abr_1','weekday_abr_2','weekday_abr_3','weekday_abr_4','weekday_abr_5','weekday_abr_6','month_name_abr_1','month_name_abr_2','month_name_abr_3','month_name_abr_4','month_name_abr_5','month_name_abr_6','month_name_abr_7','month_name_abr_8','month_name_abr_9','month_name_abr_10','month_name_abr_11','month_name_abr_12')"
        }
      }
    ]
  }
}