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 = 2 
WHERE 
  a.option_id IN (1089) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00066

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 12 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 modifier_type weight_modifier weight_modifier_type variant_name
20626 1089 509 0.000 A 0.000 A 02 | 55x98 cm
20627 1089 511 0.000 A 0.000 A 16 | 55x118 cm
20628 1089 609 0.000 A 0.000 A 03 | 66x98 cm
20629 1089 611 0.000 A 0.000 A 04 | 66x118 cm
20630 1089 614 0.000 A 0.000 A 14 | 66x140 cm
20631 1089 709 0.000 A 0.000 A 05 | 78x98 cm
20632 1089 711 0.000 A 0.000 A 06 | 78x118 cm
20633 1089 714 0.000 A 0.000 A 07 | 78x140 cm
20634 1089 716 0.000 A 0.000 A 13 | 78x160 cm
20635 1089 718 0.000 A 0.000 A 40 | 78x180 cm
20636 1089 909 0.000 A 0.000 A 15 | 94x98 cm
20637 1089 911 0.000 A 0.000 A 08 | 94x118 cm
20638 1089 914 0.000 A 0.000 A 09 | 94x140 cm
20639 1089 916 0.000 A 0.000 A 80 | 94x160 cm
20640 1089 918 0.000 A 0.000 A 41 | 94x180 cm
20641 1089 1109 0.000 A 0.000 A 20 | 114x98 cm
20642 1089 1111 0.000 A 0.000 A 10 | 114x118 cm
20643 1089 1114 0.000 A 0.000 A 11 | 114x140 cm
20644 1089 1116 0.000 A 0.000 A 50 | 114x160 cm
20645 1089 1309 0.000 A 0.000 A 12 | 134x98 cm
20646 1089 1311 0.000 A 0.000 A 18 | 134x118 cm
20647 1089 1314 0.000 A 0.000 A 17 | 134x140 cm