Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7403e9b3522d1e191e4281ef2855ad1e113c5292afd10c80f6c43910fa1caea6' 
  AND token = '6j1ALO9rjjvZIspHM7SEx3si9eBKUEvurxZUoS36RHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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