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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9394c85f67c55297f5b6579b0960ca585ed390b776f5cce630defa97928042d9' 
  AND token = 'VjAktdRvtmqK8TVuQ2LIGR3sG90enhoP4PeGGIluo90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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