Sandbox

SELECT 
  1 
FROM 
  tmall_lock_keys 
WHERE 
  key_id = 'ab3b8bd655fd30eed1dc4fdc2db34a97f8a745f9028430fd8e316e6ea675119b' 
  AND token = 'Z+NXbVJtF+dxkQqMsrdtYB/65mz95EW+AqnaamEM1Pw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00799

JSON explain

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