Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '87a8b9e1967a0a775571e72d380a7d260cd5d2398fd329257af279409066acf7' 
  AND token = 'rZJRUdpfHfXfJIElfnYBbVuuv3K6n2mqEGBTZfGl674=' 
  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"
    }
  }
}