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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5ea6863853f7a75a1e7c11b96282fff84780b752c0976ecd4ec421a77b99221c' 
  AND token = '4fYWrBprCxfNpaet4JDm6G3uK4dl/j6QrUaQZF0eXTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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