Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fc0e6d2243af714ace0fe1bd6a4b7442486563c613a8568d900c15cbc6bae51' 
  AND token = 'MUiNVT0xtvn5HmGJXJkSnhsSgcpOhZbv3663GYlM1Yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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