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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 = 'se' 
  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 = 2 
WHERE 
  a.option_id IN (1364) 
  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	ref	status,option_id,option_id_2	option_id	6	const,const	84	Using index condition; Using where; 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
24300	1364	20	A	A	55x98 cm
24299	1364	22	A	A	55x118 cm
24298	1364	30	A	A	66x98 cm
24291	1364	40	A	A	66x118 cm
24290	1364	42	A	A	66x140 cm
24292	1364	50	A	A	78x98 cm
24297	1364	60	A	A	78x118 cm
24296	1364	70	A	A	78x140 cm
24295	1364	72	A	A	78x160 cm
24294	1364	80	A	A	94x118 cm
24293	1364	90	A	A	94x140 cm
24289	1364	100	A	A	114x118 cm
24303	1364	110	A	A	114x140 cm
24302	1364	120	A	A	134x98 cm