Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fb5c50285c129290f3559c41a0ee00cdafc779be291f1ff1bd5eb17549da92c1' 
  AND token = '58mJ/jbG3DJVFjkk9lt7BS4rBabigvfrlzC/j01VpS8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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