Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '59a283cf4ed3c56a7308748596216714843244378b422e21b47baac156608981' 
  AND token = '/MVO5M85pUxa6d1ee+o1cpzcg2ueo9gTaaDxps8SAmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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