Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e248a10869515b5c4ad0681068e9c5955241efef3b933b125ea1bfbe8318ba1' 
  AND token = '0RjAhTxfGB4YyCN5yqPYzAtRKhPJ55zz7SttnkPS2oY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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