SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '80abb937bdec55aaa3d2643087f873e375577b6902dc3eb7ed0b0818c4dce674' 
  AND token = 'Bvv7xPmD/5YhTwchrhVb+s/Zhra/beUg2CZJXQgzGWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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