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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e309e9ef65b5bccf41408107912001e2177de8f792bbec889f12210616d1136' 
  AND token = '0jciIzO+63uk39PwC9R0Z2/k0KmpAH7Bc58LM8HGuv0=' 
  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"
    }
  }
}