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 = 'vi' 
WHERE 
  pfv.variant_id IN (
    72970, 72969, 72968, 72971, 73411, 73412, 
    73410, 74251, 74250, 74249, 74252, 
    74801, 74802, 75217, 75216, 75223, 
    75222, 81610, 81619, 81620, 81611, 
    81612, 81613, 81614, 81615, 81616, 
    81617, 81601, 81602, 81603, 81604, 
    81605, 81606, 81607, 81608, 81609, 
    82612, 82613, 82614, 82602, 82611, 
    82615, 82603, 82604, 82605, 82606, 
    82607, 82608, 82609, 82610, 83187, 
    83188, 83189, 83190, 83191, 84471, 
    84472, 85404, 85415, 85413, 85416, 
    85414, 85405, 85406, 85407, 85408, 
    85409, 85410, 85411, 85412, 86287, 
    86286, 86285, 86294, 86295, 86296, 
    86297, 86298, 86299, 86706, 86711, 
    86712, 86713, 86714, 86715, 86707, 
    86708, 86709, 86710
  )

Query time 0.00909

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": 89,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (72970,72969,72968,72971,73411,73412,73410,74251,74250,74249,74252,74801,74802,75217,75216,75223,75222,81610,81619,81620,81611,81612,81613,81614,81615,81616,81617,81601,81602,81603,81604,81605,81606,81607,81608,81609,82612,82613,82614,82602,82611,82615,82603,82604,82605,82606,82607,82608,82609,82610,83187,83188,83189,83190,83191,84471,84472,85404,85415,85413,85416,85414,85405,85406,85407,85408,85409,85410,85411,85412,86287,86286,86285,86294,86295,86296,86297,86298,86299,86706,86711,86712,86713,86714,86715,86707,86708,86709,86710)"
        }
      },
      {
        "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 = 'vi'"
        }
      }
    ]
  }
}