Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc4c1264886cc685092eb03d7bbfd3ad362ba43968d1b581883f616a87f64217' 
  AND token = 'U1vYDz3cqtqch+teOnBLO1k+79MzcObslmfCmLJEY5A=' 
  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"
    }
  }
}