Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5fd1d70adb7e889beebd317256a872e5882856912ec0473b173b56393085b0cd' 
  AND token = 'tu4XZgCttDdRlNMdalfvjbH7NXati5NZbhUxQxk1ULY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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