Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5baeca6ea1925b5937afdb7ee65ebb9bea76b55c41bd3cab85345d23719018' 
  AND token = 'k4MgrOHPYHhyEDplNf2sVAi/PlsH1Yj58MwYOYUQsu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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