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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '128ed4cef072b8fc5adcf60e2702bc2f929762d8c97db8cd4c1610f96b25a2e9' 
  AND token = 'E6V3DJve78Ol6aOC5/RTod7hcSkWhJILBgBsuZDKIUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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