Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa150ea5d1f3dae58ebcc8a67e6b263c04e4382b847ce164664fe37432bf2b2b' 
  AND token = '6YKXQyRsgtqfnMSxUR3nPcA36QlQj/dfoT3/d9Di+Rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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