Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df225c55daec66cda0994fbb1e31de253b1079e0d78f2d790d2479b4d654fcd8' 
  AND token = 'xhiIlrOB4zllQ6blX+k5cP6QyuDQ6q1CX/4UNOWwuk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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