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 (
    74799, 74800, 74803, 74804, 74805, 74806, 
    75211, 75210, 75622, 75623, 75624, 
    75625, 75626, 76705, 76704, 76703, 
    76706, 77111, 77110, 77120, 77118, 
    77119, 77121, 81626, 81601, 81610, 
    81611, 81612, 81613, 81614, 81615, 
    81616, 81617, 81602, 81603, 81604, 
    81605, 81606, 81607, 81608, 81609, 
    81627, 81628, 85250, 85249, 85251, 
    85252, 85253, 85254, 85255, 85256, 
    85257, 86729, 86725, 86731, 86728, 
    86730, 86727, 86726, 87185, 87189, 
    87188, 87187, 87186, 84152, 87604, 
    84154, 87603, 87602, 87601, 84156, 
    84153
  )

Query time 0.00332

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": 72,
          "filtered": 100,
          "index_condition": "pfv.variant_id in (74799,74800,74803,74804,74805,74806,75211,75210,75622,75623,75624,75625,75626,76705,76704,76703,76706,77111,77110,77120,77118,77119,77121,81626,81601,81610,81611,81612,81613,81614,81615,81616,81617,81602,81603,81604,81605,81606,81607,81608,81609,81627,81628,85250,85249,85251,85252,85253,85254,85255,85256,85257,86729,86725,86731,86728,86730,86727,86726,87185,87189,87188,87187,87186,84152,87604,84154,87603,87602,87601,84156,84153)"
        }
      },
      {
        "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'"
        }
      }
    ]
  }
}