SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30cc16ab17133e822df8571f5f83fc3488ef9a9b5af90220b527bff4a62488ec' 
  AND token = 'Rrsl6cOOHk/NfEVeCXUDCihaplM6LVXkbVbUrumfd2Q=' 
  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"
    }
  }
}