Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9616639aeb1c638af68815a3a8f59391e3539ec00d39b6e2629fc8d1095c61cd' 
  AND token = 'jwH9yPz3XbOCWQm4P3904EUTjOk4iJ6VCRrzQT8n9e4=' 
  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"
    }
  }
}