Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7052849333678bb487c1ab99999ba94421333a9988b6afd1591ba84bae8eead3' 
  AND token = 'FIUs2/m5RMFxH35zQ/ErT8JmNZU8dzPb3XABIJ7wFno=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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