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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '632b7769c9674a452cc607d7ba75cb1f585726500c5cfe4f51c7758669fc8036' 
  AND token = 'gukWHBJqlfs7yjNyR8WOyhZPOkkB9suR9mnbgByeyvU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00881

JSON explain

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