SELECT 
  1 
FROM 
  vi_lock_keys 
WHERE 
  key_id = '27bac32b53c4101611ebd3325435decd4a23218d36e9e81f52c401fa3ecd49d4' 
  AND token = '6+F3hZBVZ2ZZTAMK7VOyiwMI+vIjH80deV/Bgj5waWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00009

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}