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 (1) 
  AND cfv.parent_name IN ('filter_values_set') 
ORDER BY 
  cfv.order ASC

Query time 0.00127

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "cfv.`order`",
        "table": {
          "table_name": "cfv",
          "access_type": "ALL",
          "rows": 1025,
          "filtered": 100,
          "attached_condition": "cfv.parent_id = 1 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 hint is_any lang_code
1 1 filter_values_set 1 Amnennar N de
2 1 filter_values_set 2 Ashbringer N de
3 1 filter_values_set 3 Auberdine N de
4 1 filter_values_set 4 Bloodfang N de
5 1 filter_values_set 5 Bonescythe N de
6 1 filter_values_set 6 Celebras N de
1044 1 filter_values_set 7 Crusader Strike RPPvP N de
7 1 filter_values_set 8 Dragonfang N de
8 1 filter_values_set 9 Dreadmist N de
9 1 filter_values_set 10 Dreadnaught N de
1045 1 filter_values_set 11 Dragon's Call N de
10 1 filter_values_set 12 Earthshaker N de
11 1 filter_values_set 13 Eisenfeind N de
1046 1 filter_values_set 14 Everlook N de
12 1 filter_values_set 15 Ewige Warte N de
13 1 filter_values_set 16 Finkle N de
14 1 filter_values_set 17 Firemaw N de
15 1 filter_values_set 18 Flamelash N de
16 1 filter_values_set 19 Flickwerk N de
1047 1 filter_values_set 20 Gandling N de
17 1 filter_values_set 21 Gehennas N de
18 1 filter_values_set 22 Golemagg N de
19 1 filter_values_set 23 Großdrachenruf N de
1048 1 filter_values_set 24 Heartstriker N de
20 1 filter_values_set 25 Herzensbrecher N de
21 1 filter_values_set 26 Hydraxian Waterlords N de
22 1 filter_values_set 27 Judgement N de
23 1 filter_values_set 28 Kingsfall N de
24 1 filter_values_set 29 Klingenhauer N de
1049 1 filter_values_set 30 Lakeshire N de
1050 1 filter_values_set 31 Lava Lash RP N de
1051 1 filter_values_set 32 Living Flame PvP N de
1052 1 filter_values_set 33 Lone Wolf PvP N de
25 1 filter_values_set 34 Lucifron N de
26 1 filter_values_set 35 Mandokir N de
27 1 filter_values_set 36 Mirage Raceway N de
28 1 filter_values_set 37 Mograine N de
29 1 filter_values_set 38 Nethergarde Keep N de
30 1 filter_values_set 39 Noggenfogger N de
1053 1 filter_values_set 40 Patchwerk N de
31 1 filter_values_set 41 Pyrewood Village N de
32 1 filter_values_set 42 Quel'Serrar N de
1054 1 filter_values_set 43 Razorfen N de
33 1 filter_values_set 44 Razorgore N de
34 1 filter_values_set 45 Seenhain N de
35 1 filter_values_set 46 Shazzrah N de
36 1 filter_values_set 47 Skullflame N de
37 1 filter_values_set 48 Stonespine N de
38 1 filter_values_set 49 Sulfuron N de
39 1 filter_values_set 50 Ten Storms N de
1055 1 filter_values_set 51 Transcendence N de
40 1 filter_values_set 52 Tranzendenz N de
41 1 filter_values_set 53 Venoxis N de
1056 1 filter_values_set 54 Wild Growth PvE N de
42 1 filter_values_set 55 Zandalar Tribe N de