Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c59a98c59ac4602daea5cd083e74f7c3dbeb3a7df42670b8f58011086d6b3d4' 
  AND token = 'jaqdtQ+SO6o8XPjVPdhBm6sLJlcM7RcfIzIkz0v3WJQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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