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SELECT 
  b.variant_name, 
  a.*, 
  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 b.variant_id = a.variant_id 
  AND b.lang_code = 'en' 
  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 = 1 
WHERE 
  1 
  AND a.option_id IN (
    2604, 2650, 518, 2634, 2584, 2581, 544, 
    541, 2571, 2606, 2645, 2619, 2689, 2631, 
    2630, 2629, 2628, 2627, 2626
  ) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00104

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		38	Using index condition; Using filesort
1	SIMPLE	b	eq_ref	PRIMARY	PRIMARY	9	toolboxdigitalshop_dev.a.variant_id,const	1	Using where
1	SIMPLE	shared_option_variants	eq_ref	PRIMARY,company_id	PRIMARY	7	toolboxdigitalshop_dev.a.variant_id,const	1

Result

variant_name	variant_id	option_id	position	modifier	modifier_type	weight_modifier_type	point_modifier_type	status
MP3	1035	518	1	0.000	A	A	A	A
MP3	1081	541	1	0.000	A	A	A	A
MP3	1087	544	1	0.000	A	A	A	A
MP3	5141	2571	1	0.000	A	A	A	A
MP3	5161	2581	1	0.000	A	A	A	A
MP3	5167	2584	1	0.000	A	A	A	A
MP3	5207	2604	1	0.000	A	A	A	A
MP3	5211	2606	1	0.000	A	A	A	A
MP3	5237	2619	1	0.000	A	A	A	A
MP3	5251	2626	1	0.000	A	A	A	A
MP3	5253	2627	1	0.000	A	A	A	A
MP3	5255	2628	1	0.000	A	A	A	A
MP3	5257	2629	1	0.000	A	A	A	A
MP3	5259	2630	1	0.000	A	A	A	A
MP3	5261	2631	1	0.000	A	A	A	A
MP3	5267	2634	1	0.000	A	A	A	A
MP3	5289	2645	1	0.000	A	A	A	A
MP3	5299	2650	1	0.000	A	A	A	A
MP3	5377	2689	1	0.000	A	A	A	A
WAV	1036	518	2	0.300	A	A	A	A
WAV	1082	541	2	0.300	A	A	A	A
WAV	1088	544	2	0.300	A	A	A	A
WAV	5142	2571	2	0.300	A	A	A	A
WAV	5162	2581	2	0.300	A	A	A	A
WAV	5168	2584	2	0.300	A	A	A	A
WAV	5208	2604	2	0.300	A	A	A	A
WAV	5212	2606	2	0.300	A	A	A	A
WAV	5238	2619	2	0.300	A	A	A	A
WAV	5252	2626	2	0.300	A	A	A	A
WAV	5254	2627	2	0.300	A	A	A	A
WAV	5256	2628	2	0.300	A	A	A	A
WAV	5258	2629	2	0.300	A	A	A	A
WAV	5260	2630	2	0.300	A	A	A	A
WAV	5262	2631	2	0.300	A	A	A	A
WAV	5268	2634	2	0.300	A	A	A	A
WAV	5290	2645	2	0.300	A	A	A	A
WAV	5300	2650	2	0.300	A	A	A	A
WAV	5378	2689	2	0.300	A	A	A	A