Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fcc784fb186209aac2d55c88d3fd3231d1b6fd0c6ecd49b0e3c2ca29fc72e90' 
  AND token = 'bnYj/wEl9HbWuXScdPf6lTzrHcwWdFDjOR/JlfB5Ad8=' 
  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"
    }
  }
}