Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '547bf1c8309d0c19925c61631b7008326a2dd72db4993dbc56248e3d38ce36f3' 
  AND token = 'fD2rOyAfhPZzHYSBZjNWZO/1b6lMthpxIFeyEFvAgOE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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