Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4bfe5b631f274ed585dad93dbb5ed9064501594ccb4595b7881925b64f9f1dda' 
  AND token = '2Lq5oqN9uhlyD2oveF9t96PDx884wnSK4MiXbYhtHCc=' 
  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"
    }
  }
}