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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b9025098a6ab46aa42e6401af7e84c4c71a524f505e1cc3e9655ac906dea987' 
  AND token = 'B05idpdiHjvwUp63hf8tobEqUh6/8IbPj+L9wlUULak=' 
  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"
    }
  }
}