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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'baf084fffdddfad61479b8fb3dcfb6c3d173aa5cb401a988c5fa380b14a58970' 
  AND token = 'ko2rR3UjFi6bClZphkwk4HdfVQW+j7rGuElO+axPlb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01058

JSON explain

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