Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b6cac46d86eba28aa73e3edd96c10a13078f8115fac90d280c1181f7e4a2840' 
  AND token = 'VEr967RMOJAmlFNX6F9nIjPOhQJtFuoREQvhivbtPdY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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