Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5817643571a3a06422613d894af70f89e3b5bb9058111129a012bf1a7f0b958f' 
  AND token = 'pOLUfEHrABMROcwB4oqIsjKuekLG9IPVTyx3Acu9Qtg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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