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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '7db66b61d6ba689d4edb8717d7bac992b2c6d35f76e1743522000873db0d409b' 
  AND token = 'usNwK953yDRn53sYS8KVUu3V54UdnlGYCVEZaU+sbFs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00778

JSON explain

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