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SELECT 
  b.variant_name, 
  a.* 
FROM 
  cscart_product_option_variants AS a 
  LEFT JOIN cscart_product_option_variants_descriptions AS b ON b.variant_id = a.variant_id 
  AND b.lang_code = 'fr' 
WHERE 
  1 
  AND a.option_id IN (32, 170, 205, 34, 50, 158, 52, 9) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00046

JSON explain

{
  "query_block": {
    "select_id": 1,
    "read_sorted_file": {
      "filesort": {
        "sort_key": "a.position, a.variant_id",
        "table": {
          "table_name": "a",
          "access_type": "range",
          "possible_keys": ["status", "option_id", "option_id_2"],
          "key": "option_id",
          "key_length": "6",
          "used_key_parts": ["option_id", "status"],
          "rows": 29,
          "filtered": 100,
          "index_condition": "a.option_id in (32,170,205,34,50,158,52,9) and a.`status` = 'A'"
        }
      }
    },
    "table": {
      "table_name": "b",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["variant_id", "lang_code"],
      "ref": ["multi_vendor.a.variant_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(b.lang_code = 'fr')"
    }
  }
}

Result

variant_name	variant_id	option_id	position	modifier	modifier_type	weight_modifier_type	point_modifier_type	status
	314	50	0	0.000	A	A	A	A
	318	52	0	0.000	A	A	A	A
Pas utile pour cette commande	502	9	0	0.000	A	A	A	A
	505	158	0	0.000	A	A	A	A
Teinte A1	17	9	1	0.000	A	A	A	A
	312	50	1	0.000	A	A	A	A
	316	52	1	0.000	A	A	A	A
	504	158	1	0.000	A	A	A	A
Teinte A2	18	9	2	0.000	A	A	A	A
Teinte A3	19	9	3	0.000	A	A	A	A
Teinte A3.5	181	9	4	0.000	A	A	A	A
Teinte A4	183	9	5	0.000	A	A	A	A
Teinte B1	185	9	6	0.000	A	A	A	A
Teinte B2	187	9	7	0.000	A	A	A	A
Teinte B3	189	9	8	0.000	A	A	A	A
Teinte B4	191	9	9	0.000	A	A	A	A
Teinte C1	193	9	10	0.000	A	A	A	A
Inlay - Onlay Composite	611	205	10	0.000	A	A	A	A
Teinte C2	195	9	11	0.000	A	A	A	A
Teinte C3	197	9	12	0.000	A	A	A	A
Teinte C4	199	9	13	0.000	A	A	A	A
Teinte D2	201	9	14	0.000	A	A	A	A
Teinte D3	203	9	15	0.000	A	A	A	A
Teinte D4	205	9	16	0.000	A	A	A	A
Inlay - Onlay Céramique	612	205	20	39.000	A	A	A	A
Inlay - Onlay Emax	613	205	30	59.000	A	A	A	A