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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0bef5d9ccc7cc0c052c2b06eacd329d51b53bd108af003fd3853a48c3d4e83c5' 
  AND token = 'QCrimaqBm5pBjrln+5ZxASJ9Zc0nulMjmXSeN/WILY0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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