SELECT 
  a.variant_id, 
  a.option_id, 
  a.position, 
  a.modifier, 
  a.modifier_type, 
  a.weight_modifier, 
  a.weight_modifier_type, 
  a.nav_skus, 
  a.commercial_modifier, 
  a.commercial_dn, 
  a.same_as_option, 
  a.price_overrides, 
  a.base_cost, 
  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 = '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 
  a.option_id IN (23414) 
  AND a.status = 'A' 
ORDER BY 
  a.position, 
  a.variant_id

Query time 0.00094

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
    },
    "read_sorted_file": {
      "filesort": {
        "sort_key": "a.position, a.variant_id",
        "table": {
          "table_name": "a",
          "access_type": "ref",
          "possible_keys": ["option_id", "option_id_2", "status"],
          "key": "option_id",
          "key_length": "6",
          "used_key_parts": ["option_id", "status"],
          "ref": ["const", "const"],
          "rows": 39,
          "filtered": 100,
          "index_condition": "a.`status` = 'A'",
          "attached_condition": "a.option_id <=> 23414 and a.`status` <=> 'A'"
        }
      }
    },
    "table": {
      "table_name": "b",
      "access_type": "eq_ref",
      "possible_keys": ["PRIMARY"],
      "key": "PRIMARY",
      "key_length": "9",
      "used_key_parts": ["variant_id", "lang_code"],
      "ref": ["cscart_migrate.a.variant_id", "const"],
      "rows": 1,
      "filtered": 100,
      "attached_condition": "trigcond(b.lang_code = 'en')"
    }
  }
}

Result

variant_id option_id position modifier modifier_type weight_modifier weight_modifier_type nav_skus commercial_modifier commercial_dn same_as_option price_overrides base_cost variant_name
234857 23414 0 0.000 A 0.000 A unselected 0.00 0.00 0 0.00 Please select
234831 23414 1 0.000 A 0.000 A 100 0.00 0.00 0 0.00 100-Black
234832 23414 5 0.000 A 0.000 A 105 0.00 0.00 0 0.00 105-Textured Black
234833 23414 10 0.000 A 0.000 A 200 0.00 0.00 0 0.00 200-White
234834 23414 15 0.000 A 0.000 A 300 0.00 0.00 0 0.00 300-Dark Green
234835 23414 20 0.000 A 0.000 A 975 0.00 0.00 0 0.00 975-Galvanized
234836 23414 25 0.000 A 0.000 A 605 0.00 0.00 0 0.00 605-Rust
237212 23414 27 18.000 A 0.000 A 106 0.00 0.00 0 0.00 106-Matte Black
237213 23414 28 18.000 A 0.000 A 206 0.00 0.00 0 0.00 206-Matte White
234837 23414 30 18.000 A 0.000 A 307 0.00 0.00 0 0.00 307-Emerald Green
234838 23414 35 18.000 A 0.000 A 370 0.00 0.00 0 0.00 370-Mint
234839 23414 40 18.000 A 0.000 A 380 0.00 0.00 0 0.00 380-Chartreuse
234840 23414 45 18.000 A 0.000 A 390 0.00 0.00 0 0.00 390-Teal
234841 23414 50 18.000 A 0.000 A 400 0.00 0.00 0 0.00 400-Barn Red
234842 23414 55 18.000 A 0.000 A 420 0.00 0.00 0 0.00 420-Orange
234843 23414 60 18.000 A 0.000 A 470 0.00 0.00 0 0.00 470-Watermelon
234844 23414 65 18.000 A 0.000 A 480 0.00 0.00 0 0.00 480-Blush Pink
234845 23414 70 18.000 A 0.000 A 490 0.00 0.00 0 0.00 490-Magenta
234846 23414 75 18.000 A 0.000 A 495 0.00 0.00 0 0.00 495-Sherbet Orange
234847 23414 80 18.000 A 0.000 A 500 0.00 0.00 0 0.00 500-Buttery Yellow
234848 23414 85 18.000 A 0.000 A 570 0.00 0.00 0 0.00 570-Sunflower
234849 23414 90 18.000 A 0.000 A 600 0.00 0.00 0 0.00 600-Bronze
234850 23414 95 18.000 A 0.000 A 601 0.00 0.00 0 0.00 601-Chocolate
234851 23414 100 18.000 A 0.000 A 615 0.00 0.00 0 0.00 615-Oil-Rubbed Bronze
234852 23414 105 18.000 A 0.000 A 700 0.00 0.00 0 0.00 700-Royal Blue
234853 23414 110 18.000 A 0.000 A 705 0.00 0.00 0 0.00 705-Navy
234854 23414 115 18.000 A 0.000 A 800 0.00 0.00 0 0.00 800-Industrial Grey
234855 23414 120 18.000 A 0.000 A 805 0.00 0.00 0 0.00 805-Charcoal Granite
234820 23414 125 18.000 A 0.000 A 150 0.00 0.00 0 0.00 150-Black
234821 23414 130 18.000 A 0.000 A 250 0.00 0.00 0 0.00 250-White
234822 23414 135 18.000 A 0.000 A 350 0.00 0.00 0 0.00 350-Vintage Green
234823 23414 140 18.000 A 0.000 A 355 0.00 0.00 0 0.00 355-Jadite
234824 23414 145 29.000 A 0.000 A 455 0.00 0.00 0 0.00 455-Cherry Red
234825 23414 150 29.000 A 0.000 A 550 0.00 0.00 0 0.00 550-Yellow
234826 23414 155 18.000 A 0.000 A 650 0.00 0.00 0 0.00 650-Bronze
234827 23414 160 29.000 A 0.000 A 750 0.00 0.00 0 0.00 750-Cobalt Blue
234828 23414 165 29.000 A 0.000 A 765 0.00 0.00 0 0.00 765-Delphite Blue
234829 23414 170 29.000 A 0.000 A 850 0.00 0.00 0 0.00 850-Graphite
234830 23414 175 29.000 A 0.000 A 950 0.00 0.00 0 0.00 950-Metallic Chrome