Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b071cc08dfb3313039d3ede36691a28919b23b6e8ca6f930a4512a2b6f76caa8' 
  AND token = 'do3en6ioFbp2Pzhpw46ZJD2acslZjJ+WJjMggSOQRnw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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