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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438b90c92f861d87ef1bc6ca35d8441006b6ceb41889e6ec39aa3c6480eba45a' 
  AND token = 'gWqM+r0B7GOq5v77QLFVPHn8Vq1YcJ6XKaqMzAQOxGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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