Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad23fdd44f93d3a79a2d1dc55a346285f7e862fd13ea5e6ed2516a5e429ea895' 
  AND token = 'T0vCaSGZAa67x9XIYvnufk+Wj03zumMb3mStOefzRNU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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