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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eff0b8a85179ad1f4bc5900e21e8ee04571fa9084515c4f4b5205f429e2869e8' 
  AND token = 'P6iNcOrbS+hL5nckeKDKN81PYjB65ZL1paZEGmnbQ9Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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