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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'bf8137543a2b8889f7046f2794ccfbf40c915382d5f0a74d7effaf154ce12d95' 
  AND token = 'OvP5xW9Kk4jyYP9WTGI1oJ4B0YIzyrofACjkwByFI5s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.01009

JSON explain

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