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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7d5dbbf4b905f39cb1e11ef5db9a3b8913fe18d7568b5f6c8df3e683bf80f594' 
  AND token = 'D05BdFPcAdjRxAsU6+FHsoZQKtIG7wNFWtJ5r2O1qgY=' 
  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"
    }
  }
}