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 (178, 1221, 1218) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00072

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 14 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
4240 178 10 0.000 A 0.000 A RAL 8004 - tegelröd
22769 1218 10 0.000 A 0.000 A Tegelröd (RAL 8004)
22800 1221 10 0.000 A 0.000 A Tegelröd (RAL 8004)
4241 178 20 0.000 A 0.000 A RAL 8017 - brun
22770 1218 20 0.000 A 0.000 A Brun (RAL 8017)
22799 1221 20 0.000 A 0.000 A Brun (RAL 8017)
4242 178 30 0.000 A 0.000 A RAL 8019 - kaffe brun
22771 1218 30 0.000 A 0.000 A Kaffe brun (RAL 8019)
22798 1221 30 0.000 A 0.000 A Kaffe brun (RAL 8019)
4243 178 40 0.000 A 0.000 A RAL 7016 - antracitgrå
22772 1218 40 0.000 A 0.000 A Röd-brun (RAL 8012)
22797 1221 40 0.000 A 0.000 A Röd-brun (RAL 8012)
4244 178 50 0.000 A 0.000 A RAL 9005 - svart
22773 1218 50 0.000 A 0.000 A Röd (RAL 3004)
22796 1221 50 0.000 A 0.000 A Röd (RAL 3004)
4245 178 60 0.000 A 0.000 A RAL 3011 - röd
22774 1218 60 0.000 A 0.000 A Svart (RAL 9005)
22793 1221 60 0.000 A 0.000 A Svart (RAL 9005)
4246 178 70 0.000 A 0.000 A RAL 8012 - röd-brun
22775 1218 70 0.000 A 0.000 A Antracitgrå (RAL 7016)
22795 1221 70 0.000 A 0.000 A Antracitgrå (RAL 7016)
22776 1218 80 0.000 A 0.000 A Grön (RAL 6020)
22794 1221 80 0.000 A 0.000 A Grön (RAL 6020)