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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, 
  a.point_modifier, 
  a.point_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 = 'it' 
  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 (
    1501, 1552, 1603, 1504, 1555, 1606, 1505, 
    1556, 1607, 1391, 1420, 1449, 1401, 
    1430, 1459, 1404, 1433, 1462, 1630, 
    1651, 1672, 1696, 1727, 1758, 1293, 
    1339, 1385, 1294, 1340, 1386, 3883, 
    3904, 3925, 104, 1886, 1900, 1914
  ) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00148

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "164.41"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "49.00"
      },
      "nested_loop": [
        {
          "table": {
            "table_name": "shared_option_variants",
            "access_type": "system",
            "possible_keys": [
              "PRIMARY",
              "company_id"
            ],
            "rows_examined_per_scan": 0,
            "rows_produced_per_join": 1,
            "filtered": "0.00",
            "const_row_not_found": true,
            "cost_info": {
              "read_cost": "0.00",
              "eval_cost": "0.20",
              "prefix_cost": "0.00",
              "data_read_per_join": "24"
            },
            "used_columns": [
              "variant_id",
              "company_id",
              "modifier",
              "modifier_type"
            ]
          }
        },
        {
          "table": {
            "table_name": "a",
            "access_type": "range",
            "possible_keys": [
              "status",
              "option_id",
              "option_id_2"
            ],
            "key": "option_id",
            "used_key_parts": [
              "option_id",
              "status"
            ],
            "key_length": "6",
            "rows_examined_per_scan": 49,
            "rows_produced_per_join": 49,
            "filtered": "100.00",
            "index_condition": "((`eshopuga_upgr_4122`.`a`.`option_id` in (1501,1552,1603,1504,1555,1606,1505,1556,1607,1391,1420,1449,1401,1430,1459,1404,1433,1462,1630,1651,1672,1696,1727,1758,1293,1339,1385,1294,1340,1386,3883,3904,3925,104,1886,1900,1914)) and (`eshopuga_upgr_4122`.`a`.`status` = 'A'))",
            "cost_info": {
              "read_cost": "95.81",
              "eval_cost": "9.80",
              "prefix_cost": "105.61",
              "data_read_per_join": "2K"
            },
            "used_columns": [
              "variant_id",
              "option_id",
              "position",
              "modifier",
              "modifier_type",
              "weight_modifier",
              "weight_modifier_type",
              "point_modifier",
              "point_modifier_type",
              "status"
            ]
          }
        },
        {
          "table": {
            "table_name": "b",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "eshopuga_upgr_4122.a.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 49,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.00",
              "eval_cost": "9.80",
              "prefix_cost": "115.41",
              "data_read_per_join": "37K"
            },
            "used_columns": [
              "variant_id",
              "lang_code",
              "variant_name"
            ]
          }
        }
      ]
    }
  }
}

Result

variant_id	option_id	position	modifier	modifier_type	weight_modifier_type	point_modifier_type
436	104	0	0.000	A	A	A
1534	1339	0	0.000	A	A	A
1536	1340	0	0.000	A	A	A
1546	1420	0	0.000	A	A	A
1566	1430	0	0.000	A	A	A
1572	1433	0	0.000	A	A	A
1650	1552	0	0.000	A	A	A
1656	1555	0	0.000	A	A	A
1658	1556	0	0.000	A	A	A
1704	1651	0	0.000	A	A	A
1752	1727	0	0.000	A	A	A
1880	1900	0	0.000	A	A	A
3255	3904	0	0.000	A	A	A
435	104	1	5.000	A	A	A
1533	1339	1	2.000	A	A	A
1535	1340	1	2.000	A	A	A
1545	1420	1	2.000	A	A	A
1565	1430	1	2.000	A	A	A
1571	1433	1	2.000	A	A	A
1649	1552	1	2.000	A	A	A
1655	1555	1	2.000	A	A	A
1657	1556	1	2.000	A	A	A
1703	1651	1	2.000	A	A	A
1751	1727	1	2.000	A	A	A
1879	1900	1	2.000	A	A	A
3254	3904	1	2.000	A	A	A