Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d39bae0627eaa5d2f194006c1381362fa2a52e77dee90d24c2d106f0a73af26' 
  AND token = 'eJqkpDenpXk2K0Mh4XHoU7Bad4QWUTMEnxiE9/Si4k4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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