Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e972e1a02f4d195c0b5de78042f88ff6c996acf86661e783ec3d4e9d79cc5336' 
  AND token = '3gFnfIQts+U6H48Lo2OIbBccbraWawUCBPnmrBh2OGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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