Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35fb2e16af8d308e1bb2d58e79b13e4cc14876dfc941c17f54ac8a7d3afed430' 
  AND token = '4lpjQOVLXHmr7+iYXxgHUA8ScwrQGx7c8Q0W7CVmbIQ=' 
  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"
    }
  }
}