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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '921813d23699ffaccb17488422558f0b2bc7bc7749c0c55b9765b2e8312fe5ae' 
  AND token = 'Wiu+AWiAkhKh+0ka5Qbpd8gDVPuFJRx/Pb1Z57S7gO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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