SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24858e504b409337f103fabb4c64952a02e2948217fa4b6b12732a4e799d76f3' 
  AND token = 'SjSPJUSb7awZs1GC+wj9wl8/YcI/YOdIzuW+XBsBEIA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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