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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd514515dee14572128e897689a28e7123fed79a4901596c76c3291ba8f7fd8f2' 
  AND token = 'Mf1QyAg4gfjzA0EiypKD3DxPtm4MwRMxaY97i2L5OK0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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