Sandbox

SELECT 
  b.variant_name, 
  a.*, 
  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 b.variant_id = a.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 = 1 
WHERE 
  1 
  AND a.option_id IN (64, 65, 67) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00082

JSON explain

{
  "query_block": {
    "select_id": 1,
    "cost_info": {
      "query_cost": "42.17"
    },
    "ordering_operation": {
      "using_filesort": true,
      "cost_info": {
        "sort_cost": "30.60"
      },
      "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": "0.10",
              "prefix_cost": "0.00",
              "data_read_per_join": "24"
            },
            "used_columns": [
              "variant_id",
              "company_id",
              "modifier",
              "modifier_type"
            ]
          }
        },
        {
          "table": {
            "table_name": "a",
            "access_type": "ALL",
            "possible_keys": [
              "status",
              "option_id",
              "option_id_2"
            ],
            "rows_examined_per_scan": 78,
            "rows_produced_per_join": 30,
            "filtered": "39.23",
            "cost_info": {
              "read_cost": "5.45",
              "eval_cost": "3.06",
              "prefix_cost": "8.51",
              "data_read_per_join": "24K"
            },
            "used_columns": [
              "variant_id",
              "option_id",
              "position",
              "modifier",
              "modifier_type",
              "weight_modifier",
              "weight_modifier_type",
              "point_modifier",
              "point_modifier_type",
              "status",
              "yml2_variant"
            ],
            "attached_condition": "((`gaseus`.`a`.`option_id` in (64,65,67)) and (`gaseus`.`a`.`status` = 'A'))"
          }
        },
        {
          "table": {
            "table_name": "b",
            "access_type": "eq_ref",
            "possible_keys": [
              "PRIMARY"
            ],
            "key": "PRIMARY",
            "used_key_parts": [
              "variant_id",
              "lang_code"
            ],
            "key_length": "9",
            "ref": [
              "gaseus.a.variant_id",
              "const"
            ],
            "rows_examined_per_scan": 1,
            "rows_produced_per_join": 30,
            "filtered": "100.00",
            "cost_info": {
              "read_cost": "0.00",
              "eval_cost": "3.06",
              "prefix_cost": "11.57",
              "data_read_per_join": "23K"
            },
            "used_columns": [
              "variant_id",
              "lang_code",
              "variant_name"
            ]
          }
        }
      ]
    }
  }
}

Result

variant_name	variant_id	option_id	position	modifier	modifier_type	weight_modifier_type	point_modifier_type	status
DIN 477-1 (W 21.8 x 1/14 left)	436	64	10	0.000	A	A	A	A
SG 1 1/16 in	451	65	10	0.000	A	A	A	A
None	466	67	10	0.000	A	A	A	A
DIN 477-5 (W 1 left)	437	64	20	0.000	A	A	A	A
SG 2 1/8 in	452	65	20	0.000	A	A	A	A
Ball valve	467	67	20	25.000	A	A	A	A
DIN 477-6 (W 21.8 x 1/14 right)	438	64	30	0.000	A	A	A	A
SG 3 mm	453	65	30	0.000	A	A	A	A
Diaphragm valve	468	67	30	40.000	A	A	A	A
DIN 477-7 (G 5/8 IT internal thread right)	439	64	40	0.000	A	A	A	A
SG 3/16 in	454	65	40	0.000	A	A	A	A
Needle valve	469	67	40	15.000	A	A	A	A
DIN 477-8 (W 1 right)	440	64	50	0.000	A	A	A	A
SG 4 mm	455	65	50	0.000	A	A	A	A
DIN 477-9 (G 3/4 right)	441	64	60	0.000	A	A	A	A
SG 1/4 in	456	65	60	0.000	A	A	A	A
DIN 477-10 (W 24.32 x 1/14 right)	442	64	70	0.000	A	A	A	A
SG 6 mm	457	65	70	0.000	A	A	A	A
DIN 477-11 (G 3/8 right)	443	64	80	0.000	A	A	A	A
SG 3/8 in	458	65	80	0.000	A	A	A	A
DIN 477-13 (G 5/8 ET external thread right)	444	64	90	0.000	A	A	A	A
SG 8 mm	459	65	90	0.000	A	A	A	A
DIN 477-14 (M 19 x 1.5 left)	445	64	100	0.000	A	A	A	A
SG 1/2 in	460	65	100	0.000	A	A	A	A
CGA	446	64	110	0.000	A	A	A	A
SG 10 mm	461	65	110	0.000	A	A	A	A
BS341	447	64	120	0.000	A	A	A	A
SG 12 mm	462	65	120	0.000	A	A	A	A
NFE	448	64	130	0.000	A	A	A	A
NEN	449	64	140	0.000	A	A	A	A
U.N.I.	450	64	150	0.000	A	A	A	A