SELECT 
  pfv.variant_id, 
  pfv.position, 
  pfvd.variant 
FROM 
  cscart_product_feature_variants AS pfv 
  INNER JOIN cscart_product_feature_variant_descriptions AS pfvd ON pfv.variant_id = pfvd.variant_id 
  AND pfvd.lang_code = 'en' 
WHERE 
  pfv.variant_id IN (
    73183, 73182, 73181, 73180, 73184, 73205, 
    73204, 73206, 82357, 82358, 84292, 
    84291, 84293, 84766, 84409, 84410, 
    84411, 84412, 86495, 86494, 86496, 
    86499, 86498, 86497, 86501, 86500, 
    86503, 86502
  )

Query time 0.00576

JSON explain

{
  "query_block": {
    "select_id": 1,
    "nested_loop": [
      {
        "table": {
          "table_name": "pfv",
          "access_type": "range",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "3",
          "used_key_parts": ["variant_id"],
          "rows": 28,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (73183,73182,73181,73180,73184,73205,73204,73206,82357,82358,84292,84291,84293,84766,84409,84410,84411,84412,86495,86494,86496,86499,86498,86497,86501,86500,86503,86502)"
        }
      },
      {
        "table": {
          "table_name": "pfvd",
          "access_type": "eq_ref",
          "possible_keys": ["PRIMARY"],
          "key": "PRIMARY",
          "key_length": "9",
          "used_key_parts": ["variant_id", "lang_code"],
          "ref": ["dev_db.pfv.variant_id", "const"],
          "rows": 1,
          "filtered": 100,
          "index_condition": "pfvd.lang_code = 'en'"
        }
      }
    ]
  }
}