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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 (221, 566, 567, 568, 569, 565) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00059

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		9	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
14469	565	0	A	A	54x83 cm
14470	565	0	A	A	86x87 cm
14471	567	1	A	A	46x55 cm
14473	566	1	A	A	46x55 cm
14478	569	1	A	A	54x75 cm
14472	567	2	A	A	46x75 cm
14474	566	2	A	A	46x75 cm
14479	569	2	A	A	86x86 cm
6760	221	10	A	A	025 (45x55 cm)
14475	568	10	A	A	för ett slätt takmaterial (WSS)
6761	221	20	A	A	029 (45x73 cm)
14476	568	20	A	A	för ett profilerat takmaterial (WSZ)
6762	221	30	A	A	033 (85x85 cm)
14477	568	30	A	A	för ett profilerat takmaterial (WSH)
23720	221	40	A	A	024 (90x48 cm)
23721	221	50	A	A	034 (48x85 cm)