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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9e7927e8b40a994823582652d19964204314496486b1411bc8952b340bc13189' 
  AND token = 'CWsJkkpRllWxxoBZDJRHbrqEHdD8KoAJIuCFfBcQQ3s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00832

JSON explain

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