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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '946a1b7ab451e3f45863a9c8a8ae46ed71757a1d6f58b025e977a34d3ef77aab' 
  AND token = '7VM1bAUoQ7fZTW56x/zVL7YmhNDzncTJ4jNjw459qWA=' 
  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"
    }
  }
}