Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ae1338f9cb23fa800469310592d8ae89cd6957f1901ea1a063a231cbd52bf6c' 
  AND token = 'WA23o52wdaUj5ZgVX27SASbzULy5n7JfnVRROEGtCeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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