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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd4cd5fc73c90d7f881813d4d2435e479b421a8dc3628c5491a4f82d3ba6280cf' 
  AND token = 'wlyaOgRbmeHcTw5gJdGtr1snDd8JboHHt7AR/vrO2K4=' 
  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"
    }
  }
}