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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7195923296ce57eaa924f80edd0ea18afa91060413263f34217bc2e05cd04237' 
  AND token = 'a4x5QHI5UIJhqBxKcwYLuda9qBSgi/zCRvcMsoM4hcg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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