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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 = '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 
  a.option_id IN (294, 293) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00054

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		6	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
7320	293	0	A	A	for summer
11858	293	0	A	A	for winter
7378	294	10	A	A	115 x 125 x 1250 mm
7379	294	20	A	A	115 x 125 x 1500 mm
7380	294	30	A	A	115 x 125 x 2000 mm
7381	294	40	A	A	115 x 125 x 2500 mm
7382	294	50	A	A	115 x 125 x 3000 mm
7383	294	70	A	A	175 x 125 x 1250 mm
7384	294	80	A	A	175 x 125 x 1500 mm
7385	294	90	A	A	175 x 125 x 2000 mm
7386	294	100	A	A	175 x 125 x 2500 mm
7387	294	110	A	A	175 x 125 x 3000 mm