Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e1a1284ff35c6ea9a45169963fc3b6af087994e5e6b06a4c0fdf870fdc920ac' 
  AND token = 'FeJkS3g3hG3Do4mRKvBbm1gq6EQIdg4P/PoKanaaEKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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