Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc599a8236f3e2a1200de50c48104f28cd14d9248bcb368504caee875e93a4f5' 
  AND token = 'V33gNOXa5y08yOYmaZaVHWa5pHi+EzfKlBLqYETpps8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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