Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4d44b8c32e4a3d1dab7cad6206210bcedaef036388600a32092167402201b2d' 
  AND token = 'QiBo8dr3Y4Tm5bSxVHE/tITPm1syuJqG3HRYTHmdstg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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