Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4fc5c34784c79f9991f7efd033fe65fcddce9dbaf82baa3e9e46d6b642c90a6f' 
  AND token = 'Ge9uF8z0C820de0JxxpRDqjvPaMxnB8canlSmykzSyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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