Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c529b7e08cf090f1d21a6f934fb5da42a9a77209a04823fa2eb3dd81013b08e' 
  AND token = 'A805jqEYUjn+a0PeN4oQSJl3+aWEKaCXCEPbesDAvFE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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