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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19d1184d24eaa96f79667157096dee7d791678938d776d969fc2d2fe023b8fbc' 
  AND token = '47yhFYBSgJD8rpmnI5iJTuMUUprTe69orsMDsS6+Guc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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