Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9677ede5716283639beb537e60e9137ce1cfd03efc94f427c722b09851ccf38' 
  AND token = 'uen5sZpKokBaZVuO1cTH+AdvLps5ybmQdtZNO7T09b4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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