Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc240a0286624f9454a24510ad9eee26eb531c21b505cf344ed6e5a1ec55065' 
  AND token = 'qNZnp0qbwrVw3iiYYXusCV6GIqvd13FQKpznbvWBg28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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