Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2340ad6f6fe52c307239fb4703fd57a8d671719ea681d92b01f1328a162cd0b2' 
  AND token = 'Yj4TbJztRvcm9FTZFGQridbUdw9EIi+yp0orKPFNUGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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