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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f5c76e8da00a9d809adf22a67825eab75b5be30d41e66229fd87a2a99187954' 
  AND token = 'IOl5jvwduqMqPLNo1+81YDCULS4qootXBzqp/8S2UNw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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