Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '65b05d2234dca260c0b734b9edd81069550f6aa0b230fb6ca48a11a03558ffc8' 
  AND token = 'b88MkIVuzlp9TtsA6dZWQYds6WEQ0wHDqHXjoXUANHg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00799

JSON explain

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