Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '240607913f11cc17e8c2a6243c599368f506d8c41884d3958e3b295073aba3b2' 
  AND token = 'ilAzSj1rlBLz9gxdMND0UfR9AOa3mcBtruyMdF2N/Rg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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