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 (
    69666, 69665, 69667, 70183, 70182, 70181, 
    70180, 70179, 70178, 70177, 70176, 
    70239, 70238, 70237, 70236, 70235, 
    70234, 70249, 70248, 70247, 70246, 
    70245, 70244, 70243, 70242, 70241, 
    71341, 71339, 71338, 71337, 71336, 
    71335, 71334, 71333, 71332, 71331, 
    71342, 71589, 71588, 71587, 71586, 
    71585, 71590, 72337, 72336, 72338, 
    76705, 76704, 76703, 76706, 81269, 
    81270, 81621, 81601, 81609, 81608, 
    81607, 81606, 81605, 81604, 81603, 
    81602, 81617, 81616, 81615, 81614, 
    81613, 81612, 81611, 81610, 81622, 
    81623, 81624, 81625, 81705, 81706, 
    87464, 87463, 86303, 86302, 86319, 
    86318, 86317, 86316, 86594, 86595, 
    86606, 86607, 86608, 87452, 87451, 
    78095, 78105, 78094, 78104, 78112, 
    78111, 78110, 78109, 78108, 78107, 
    78106, 78096, 78097, 78098, 78099, 
    78100, 78101, 78102, 78103
  )

Query time 0.01199

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": 110,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (69666,69665,69667,70183,70182,70181,70180,70179,70178,70177,70176,70239,70238,70237,70236,70235,70234,70249,70248,70247,70246,70245,70244,70243,70242,70241,71341,71339,71338,71337,71336,71335,71334,71333,71332,71331,71342,71589,71588,71587,71586,71585,71590,72337,72336,72338,76705,76704,76703,76706,81269,81270,81621,81601,81609,81608,81607,81606,81605,81604,81603,81602,81617,81616,81615,81614,81613,81612,81611,81610,81622,81623,81624,81625,81705,81706,87464,87463,86303,86302,86319,86318,86317,86316,86594,86595,86606,86607,86608,87452,87451,78095,78105,78094,78104,78112,78111,78110,78109,78108,78107,78106,78096,78097,78098,78099,78100,78101,78102,78103)"
        }
      },
      {
        "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'"
        }
      }
    ]
  }
}