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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b68cb71b4c243c481f656cf6aad38554cf63db1fde1b17348519ffbee824a90' 
  AND token = '8RE+DVtDyXpY3bbJR9iaFefBCeu+m8xrHBLs84J1nc0=' 
  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"
    }
  }
}