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SELECT 
  a.variant_id, 
  a.option_id, 
  a.position, 
  a.modifier, 
  a.modifier_type, 
  a.weight_modifier, 
  a.weight_modifier_type, 
  b.variant_name, 
  IF(
    shared_option_variants.variant_id IS NOT NULL, 
    shared_option_variants.modifier, 
    a.modifier
  ) as modifier, 
  IF(
    shared_option_variants.variant_id IS NOT NULL, 
    shared_option_variants.modifier_type, 
    a.modifier_type
  ) as modifier_type 
FROM 
  cscart_product_option_variants as a 
  LEFT JOIN cscart_product_option_variants_descriptions as b ON a.variant_id = b.variant_id 
  AND b.lang_code = 'fr' 
  LEFT JOIN cscart_ult_product_option_variants shared_option_variants ON shared_option_variants.variant_id = a.variant_id 
  AND shared_option_variants.company_id = 3 
WHERE 
  a.option_id IN (860, 1149) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00068

Explain
id	select_type	table	type	possible_keys	key	key_len	ref	rows	Extra
1	SIMPLE	a	range	status,option_id,option_id_2	option_id	6		14	Using index condition; Using filesort
1	SIMPLE	b	eq_ref	PRIMARY	PRIMARY	9	mahm3t_cs443.a.variant_id,const	1	Using where
1	SIMPLE	shared_option_variants	eq_ref	PRIMARY,company_id	PRIMARY	7	mahm3t_cs443.a.variant_id,const	1

Result

variant_id	option_id	position	modifier_type	weight_modifier_type	variant_name
17679	860	102	A	A	CK02, C02, 102
17680	860	104	A	A	CK04, C04, 104
17681	860	106	A	A	CK06, C06
17682	860	204	A	A	FK04, F04, 204
17683	860	206	A	A	FK06, F06, 206
17684	860	208	A	A	FK08, F08
17685	860	304	A	A	MK04, M04, 304
17686	860	306	A	A	MK06, M06, 306
17687	860	308	A	A	MK08, M08, 308
17688	860	310	A	A	MK10, M10. 310
17689	860	312	A	A	MK12, M12, 312
17690	860	404	A	A	PK04, P04, 404
17691	860	406	A	A	PK06, P06, 406
17692	860	408	A	A	PK08, P08, 408
17693	860	410	A	A	PK10, P10, 410
17694	860	601	A	A	SK01, S01
17695	860	606	A	A	SK06, S06, 606
17696	860	608	A	A	SK08, S08, 608
17697	860	610	A	A	SK10, S10, 610
17698	860	804	A	A	UK04, U04, 804
17699	860	808	A	A	UK08, U08, 808
17700	860	810	A	A	UK10, U10, 810