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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05b91aa5c5c682010f127cc7c8b9800f09745f7d5a808d803387724a3ca91453' 
  AND token = 'RhPNZXoBznpaRrM4cTfz/ywEHZDKU2lb8cWFg6e3CNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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