Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7227e5a3ff5c6ba16b49231b8e0fbd0ab50c3284ffb513da5cbc07161533cdb7' 
  AND token = 'DvOnLaANnHVNXs4zbRC6pO7hA/cxvtohXoc7/AdOEXw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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