Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ff1a9e237e85ee3461220406968ee74b6c311668a9d2aafe18dd1aaebd90551' 
  AND token = 'DENXeU3iDqkuXDXUTQLq4nG9T1p7cSQ8/TPzeqRHR1E=' 
  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"
    }
  }
}