SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8acd83593f629933877ef1f9e4c001cabb33f770e1ec302018dee8677a38e622' 
  AND token = '5CaYLFKGY+nZDYT/QASOFTuwoYsrJ4VmpZ3b3o4zJW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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