SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ab13bbc40c2eac93765646d3b42b08184bb4af458b37ed5864d7bf8e5a3e9ff' 
  AND token = '20pch26OgBgLwLHfs0BPHdcgmz+K5NI5mJ/VZLzzvc4=' 
  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"
    }
  }
}