Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bcc6571c0ae208641d388d59d9cc006802f570851d7940cc352e0614895776' 
  AND token = 'lT3Gte1LxUc2tMYBpa5FzEIKpr+/vs3hpOrldtQWOOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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