SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63266b8153211c9c1c9aef1f6c22dfc42331980bc53eba2748243e1ff6233948' 
  AND token = 'hRFPcTJIvm/+fFwJjuH+Sc3UXZPmeKQHn1VuRMhlkS4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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