Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c68d8d4189cc6052bc5546073c5984431f2f56e826e9224cf7c1d8d2911b63d8' 
  AND token = 'YL3+1yrgx1rzPVngh1IH9i6dAHv94L8CQxZD7LCjQBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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