Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b12480745117f75dab9e4ce461630ad0a12e834c6511d00ce234e3479066a9a6' 
  AND token = '2vwsD9+8u4uPaAx8skqwJqE7INLwgWfWYtS8KVZSQ/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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