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 (650, 652, 653, 687) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00080

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 18 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 modifier_type weight_modifier weight_modifier_type variant_name
15459 650 20 0.000 A 0.000 A 20 mm
15689 687 20 0.000 A 0.000 A 20 mm
15488 653 25 0.000 A 0.000 A FIT
15460 650 30 0.000 A 0.000 A 30 mm
15690 687 30 0.000 A 0.000 A 30 mm
15461 650 40 0.000 A 0.000 A 40 mm
15691 687 40 0.000 A 0.000 A 40 mm
15462 650 50 0.000 A 0.000 A 50 mm
15486 652 50 0.000 A 0.000 A 600 x 1200 mm
15489 653 50 0.000 A 0.000 A LAP
15692 687 50 0.000 A 0.000 A 50 mm
15463 650 60 0.000 A 0.000 A 60 mm
15464 650 70 0.000 A 0.000 A 70 mm
15490 653 75 0.000 A 0.000 A TAG
15465 650 80 0.000 A 0.000 A 80 mm
15466 650 90 0.000 A 0.000 A 90 mm
15467 650 100 0.000 A 0.000 A 100 mm
15487 652 100 0.000 A 0.000 A 1200 x 2400 mm
15468 650 110 0.000 A 0.000 A 110 mm
15469 650 120 0.000 A 0.000 A 120 mm
15470 650 130 0.000 A 0.000 A 130 mm
15471 650 140 0.000 A 0.000 A 140 mm
15472 650 150 0.000 A 0.000 A 150 mm
15473 650 160 0.000 A 0.000 A 160 mm
15474 650 170 0.000 A 0.000 A 170 mm
15475 650 180 0.000 A 0.000 A 180 mm
15476 650 190 0.000 A 0.000 A 190 mm
15477 650 200 0.000 A 0.000 A 200 mm
15478 650 210 0.000 A 0.000 A 210 mm
15479 650 220 0.000 A 0.000 A 220 mm
15480 650 230 0.000 A 0.000 A 230 mm
15481 650 240 0.000 A 0.000 A 240 mm
15482 650 250 0.000 A 0.000 A 250 mm