Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68682b331af0e47c005d295d753658c5b68cf8aa3dea55441eed9068a40c9738' 
  AND token = 'SNpNJ9CUUe4+/kuTCwAP4+JEn7gUFEUuGU/bZTt2bUI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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