SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aec7dd42d7db8032d003a08f3cc0613b2668282c9c793114545e7d9b64e3861a' 
  AND token = 'vdCNUqTxDhnz1/sKuXVpTCoru2UlDewRSV8BJgW5SXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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