SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '868bb0d680e182c41a7355bd7d9863ceea5d11e178f516cd540609f3c3a3ca19' 
  AND token = 'BqNCB4vj+pwf8U2KZ8WDyxs1j/g/PclMz/p14Nxh890=' 
  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"
    }
  }
}