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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9cf63587a615d8726fb1758608d8b44efa5fb24584562f3692ec3c1cb2f8c141' 
  AND token = 'FqPF/e1oP40nkSX1vkoximCbSTcLEaWVYQIWQzyT1bw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00765

JSON explain

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