Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c00ca65ca564c4bca3193f7f5ead81e8d282cf14195eb6432ed463e744f7d2' 
  AND token = 'LHOJPFN3StVZp0PE3mjAsaO/rdHSS+2bCGfmPlpkbsY=' 
  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"
    }
  }
}