Sandbox

SELECT 
  a.modifier, 
  a.modifier_type, 
  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, 
  a.variant_id 
FROM 
  cscart_product_option_variants a 
  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.variant_id IN (
    233066, 237344, 232597, 235995, 236021, 
    236048, 234810, 232643, 232632, 232621, 
    232725, 232712, 232268, 236062, 236088, 
    230828, 223755
  )

Query time 0.00050

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "table_name": "shared_option_variants",
      "access_type": "system",
      "possible_keys": ["PRIMARY", "company_id"],
      "rows": 0,
      "filtered": 0,
      "const_row_not_found": true
    },
    "table": {
      "table_name": "a",
      "access_type": "range",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "3",
      "used_key_parts": ["variant_id"],
      "rows": 17,
      "filtered": 100,
      "attached_condition": "a.variant_id in (233066,237344,232597,235995,236021,236048,234810,232643,232632,232621,232725,232712,232268,236062,236088,230828,223755)"
    }
  }
}

Result

modifier	modifier_type	variant_id
0.000	A	223755
0.000	A	230828
0.000	A	232268
0.000	A	232597
0.000	A	232621
0.000	A	232632
0.000	A	232643
0.000	A	232712
0.000	A	232725
0.000	A	233066
0.000	A	234810
0.000	A	235995
0.000	A	236021
0.000	A	236048
0.000	A	236062
0.000	A	236088
0.000	A	237344