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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d9270e92be0665a70edc2890a14e578afc029601a3be46f6ddf2a1e2f8744d2' 
  AND token = 'fJTVCs02ZZmwjkMrL43kcfs5dYICswOoc4tyJFZBSJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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