Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5ccfa76e0a82e6fb3b5ba1a9e0bf0b1e816a6a0c1af7e3871b9e67b031604e' 
  AND token = 'bLUqK9xRjjHgOBE++QZNaf0NAlVCFCUdqiNfPZL531g=' 
  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"
    }
  }
}