Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf77d1af22f51dac722e4fa049291a5c3769469c911290e99132250db61fb746' 
  AND token = '9EO51EGWQKgyRnO7LSbiXlCUrQGaMfpdUPOoZKoh73I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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