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SELECT 
  cfv.category_filter_value_id, 
  cfv.parent_id, 
  cfv.parent_name, 
  cfv.order, 
  cfvd.title, 
  cfv.hint, 
  cfv.is_any, 
  cfvd.lang_code 
FROM 
  cscart_category_filter_values AS cfv 
  LEFT JOIN cscart_category_filter_value_descriptions AS cfvd ON cfv.category_filter_value_id = cfvd.category_filter_value_id 
  AND cfvd.lang_code = 'de' 
WHERE 
  1 
  AND cfv.parent_id IN (8) 
  AND cfv.parent_name IN ('filter_values_set') 
ORDER BY 
  cfv.order ASC

Query time 0.00121

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cfv.`order`",
        "table": {
          "table_name": "cfv",
          "access_type": "ALL",
          "rows": 1012,
          "filtered": 100,
          "attached_condition": "cfv.parent_id = 8 and cfv.parent_name = 'filter_values_set'"
        }
      }
    },
    "table": {
      "table_name": "cfvd",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "10",
      "used_key_parts": ["category_filter_value_id", "lang_code"],
      "ref": ["dev.cfv.category_filter_value_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(cfvd.lang_code = 'de')"
    }
  }
}

Result

category_filter_value_id	parent_id	parent_name	order	title	is_any	lang_code
484	8	filter_values_set	1	(PC) Hardcore	N	de
485	8	filter_values_set	2	(PC) Ruthless with Gold	N	de
486	8	filter_values_set	3	(PC) Standard	N	de
487	8	filter_values_set	4	(PC) The Forbidden Sanctum	N	de
488	8	filter_values_set	5	(PC) The Forbidden Sanctum [Hardcore]	N	de
489	8	filter_values_set	6	(PC) The Forbidden Sanctum [Ruthless Hardcore]	N	de
490	8	filter_values_set	7	(PC) The Forbidden Sanctum [Ruthless]	N	de
491	8	filter_values_set	8	(PS) Hardcore	N	de
492	8	filter_values_set	9	(PS) Ruthless with Gold	N	de
493	8	filter_values_set	10	(PS) Standard	N	de
494	8	filter_values_set	11	(PS) The Forbidden Sanctum	N	de
495	8	filter_values_set	12	(PS) The Forbidden Sanctum [Hardcore]	N	de
496	8	filter_values_set	13	(PS) The Forbidden Sanctum [Ruthless Hardcore]	N	de
497	8	filter_values_set	14	(PS) The Forbidden Sanctum [Ruthless]	N	de
498	8	filter_values_set	15	(Xbox) Hardcore	N	de
499	8	filter_values_set	16	(Xbox) Ruthless with Gold	N	de
500	8	filter_values_set	17	(Xbox) Standard	N	de
501	8	filter_values_set	18	(Xbox) The Forbidden Sanctum	N	de
502	8	filter_values_set	19	(Xbox) The Forbidden Sanctum [Hardcore]	N	de
503	8	filter_values_set	20	(Xbox) The Forbidden Sanctum [Ruthless Hardcore]	N	de
504	8	filter_values_set	21	(Xbox) The Forbidden Sanctum [Ruthless]	N	de