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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44fb7497b15445ce2d6c6122e67bf145fef344135444a75ec7020a104db38dea' 
  AND token = 'RO/0W03sKD2Jso/k/VyaabPV8EJInS/KB0eVysHICOU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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