Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '21ddf6e9318767c68531ca2c6683c28826e16e5af217be6e7c3792b9c0a7cbd8' 
  AND token = 'MOy5PZP0cuBYOPSgv9VCgQJLJOnDC5AThrE3i8HpzIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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