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SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = '9356ca0998a1a8fbe70fd6d46916a4598a04afef877f2b16f10d9394b5e9143c' 
  AND token = '3rKyGuKJaVPzjV1OhC9Bdnyw88r+8yo7UxPNEuTz0hA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00770

JSON explain

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